Use undoview from deps/third_party/

    
BUG=111334
Review URL: https://chromiumcodereview.appspot.com/9293016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120056 0039d316-1c4b-4281-b951-d872f2087c98

7 files changed, 0 insertions, 1866 deletions

diff --git a/third_party/undoview/LICENSE b/third_party/undoview/LICENSE
deleted file mode 100644
index 4362b49..0000000
--- a/third_party/undoview/LICENSE
+++ /dev/null
@@ -1,502 +0,0 @@
-                  GNU LESSER GENERAL PUBLIC LICENSE
-                       Version 2.1, February 1999
-
- Copyright (C) 1991, 1999 Free Software Foundation, Inc.
- 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-[This is the first released version of the Lesser GPL.  It also counts
- as the successor of the GNU Library Public License, version 2, hence
- the version number 2.1.]
-
-                            Preamble
-
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-Licenses are intended to guarantee your freedom to share and change
-free software--to make sure the software is free for all its users.
-
-  This license, the Lesser General Public License, applies to some
-specially designated software packages--typically libraries--of the
-Free Software Foundation and other authors who decide to use it.  You
-can use it too, but we suggest you first think carefully about whether
-this license or the ordinary General Public License is the better
-strategy to use in any particular case, based on the explanations below.
-
-  When we speak of free software, we are referring to freedom of use,
-not price.  Our General Public Licenses are designed to make sure that
-you have the freedom to distribute copies of free software (and charge
-for this service if you wish); that you receive source code or can get
-it if you want it; that you can change the software and use pieces of
-it in new free programs; and that you are informed that you can do
-these things.
-
-  To protect your rights, we need to make restrictions that forbid
-distributors to deny you these rights or to ask you to surrender these
-rights.  These restrictions translate to certain responsibilities for
-you if you distribute copies of the library or if you modify it.
-
-  For example, if you distribute copies of the library, whether gratis
-or for a fee, you must give the recipients all the rights that we gave
-you.  You must make sure that they, too, receive or can get the source
-code.  If you link other code with the library, you must provide
-complete object files to the recipients, so that they can relink them
-with the library after making changes to the library and recompiling
-it.  And you must show them these terms so they know their rights.
-
-  We protect your rights with a two-step method: (1) we copyright the
-library, and (2) we offer you this license, which gives you legal
-permission to copy, distribute and/or modify the library.
-
-  To protect each distributor, we want to make it very clear that
-there is no warranty for the free library.  Also, if the library is
-modified by someone else and passed on, the recipients should know
-that what they have is not the original version, so that the original
-author's reputation will not be affected by problems that might be
-introduced by others.
-
-  Finally, software patents pose a constant threat to the existence of
-any free program.  We wish to make sure that a company cannot
-effectively restrict the users of a free program by obtaining a
-restrictive license from a patent holder.  Therefore, we insist that
-any patent license obtained for a version of the library must be
-consistent with the full freedom of use specified in this license.
-
-  Most GNU software, including some libraries, is covered by the
-ordinary GNU General Public License.  This license, the GNU Lesser
-General Public License, applies to certain designated libraries, and
-is quite different from the ordinary General Public License.  We use
-this license for certain libraries in order to permit linking those
-libraries into non-free programs.
-
-  When a program is linked with a library, whether statically or using
-a shared library, the combination of the two is legally speaking a
-combined work, a derivative of the original library.  The ordinary
-General Public License therefore permits such linking only if the
-entire combination fits its criteria of freedom.  The Lesser General
-Public License permits more lax criteria for linking other code with
-the library.
-
-  We call this license the "Lesser" General Public License because it
-does Less to protect the user's freedom than the ordinary General
-Public License.  It also provides other free software developers Less
-of an advantage over competing non-free programs.  These disadvantages
-are the reason we use the ordinary General Public License for many
-libraries.  However, the Lesser license provides advantages in certain
-special circumstances.
-
-  For example, on rare occasions, there may be a special need to
-encourage the widest possible use of a certain library, so that it becomes
-a de-facto standard.  To achieve this, non-free programs must be
-allowed to use the library.  A more frequent case is that a free
-library does the same job as widely used non-free libraries.  In this
-case, there is little to gain by limiting the free library to free
-software only, so we use the Lesser General Public License.
-
-  In other cases, permission to use a particular library in non-free
-programs enables a greater number of people to use a large body of
-free software.  For example, permission to use the GNU C Library in
-non-free programs enables many more people to use the whole GNU
-operating system, as well as its variant, the GNU/Linux operating
-system.
-
-  Although the Lesser General Public License is Less protective of the
-users' freedom, it does ensure that the user of a program that is
-linked with the Library has the freedom and the wherewithal to run
-that program using a modified version of the Library.
-
-  The precise terms and conditions for copying, distribution and
-modification follow.  Pay close attention to the difference between a
-"work based on the library" and a "work that uses the library".  The
-former contains code derived from the library, whereas the latter must
-be combined with the library in order to run.
-
-                  GNU LESSER GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
-
-  0. This License Agreement applies to any software library or other
-program which contains a notice placed by the copyright holder or
-other authorized party saying it may be distributed under the terms of
-this Lesser General Public License (also called "this License").
-Each licensee is addressed as "you".
-
-  A "library" means a collection of software functions and/or data
-prepared so as to be conveniently linked with application programs
-(which use some of those functions and data) to form executables.
-
-  The "Library", below, refers to any such software library or work
-which has been distributed under these terms.  A "work based on the
-Library" means either the Library or any derivative work under
-copyright law: that is to say, a work containing the Library or a
-portion of it, either verbatim or with modifications and/or translated
-straightforwardly into another language.  (Hereinafter, translation is
-included without limitation in the term "modification".)
-
-  "Source code" for a work means the preferred form of the work for
-making modifications to it.  For a library, complete source code means
-all the source code for all modules it contains, plus any associated
-interface definition files, plus the scripts used to control compilation
-and installation of the library.
-
-  Activities other than copying, distribution and modification are not
-covered by this License; they are outside its scope.  The act of
-running a program using the Library is not restricted, and output from
-such a program is covered only if its contents constitute a work based
-on the Library (independent of the use of the Library in a tool for
-writing it).  Whether that is true depends on what the Library does
-and what the program that uses the Library does.
-
-  1. You may copy and distribute verbatim copies of the Library's
-complete source code as you receive it, in any medium, provided that
-you conspicuously and appropriately publish on each copy an
-appropriate copyright notice and disclaimer of warranty; keep intact
-all the notices that refer to this License and to the absence of any
-warranty; and distribute a copy of this License along with the
-Library.
-
-  You may charge a fee for the physical act of transferring a copy,
-and you may at your option offer warranty protection in exchange for a
-fee.
-
-  2. You may modify your copy or copies of the Library or any portion
-of it, thus forming a work based on the Library, and copy and
-distribute such modifications or work under the terms of Section 1
-above, provided that you also meet all of these conditions:
-
-    a) The modified work must itself be a software library.
-
-    b) You must cause the files modified to carry prominent notices
-    stating that you changed the files and the date of any change.
-
-    c) You must cause the whole of the work to be licensed at no
-    charge to all third parties under the terms of this License.
-
-    d) If a facility in the modified Library refers to a function or a
-    table of data to be supplied by an application program that uses
-    the facility, other than as an argument passed when the facility
-    is invoked, then you must make a good faith effort to ensure that,
-    in the event an application does not supply such function or
-    table, the facility still operates, and performs whatever part of
-    its purpose remains meaningful.
-
-    (For example, a function in a library to compute square roots has
-    a purpose that is entirely well-defined independent of the
-    application.  Therefore, Subsection 2d requires that any
-    application-supplied function or table used by this function must
-    be optional: if the application does not supply it, the square
-    root function must still compute square roots.)
-
-These requirements apply to the modified work as a whole.  If
-identifiable sections of that work are not derived from the Library,
-and can be reasonably considered independent and separate works in
-themselves, then this License, and its terms, do not apply to those
-sections when you distribute them as separate works.  But when you
-distribute the same sections as part of a whole which is a work based
-on the Library, the distribution of the whole must be on the terms of
-this License, whose permissions for other licensees extend to the
-entire whole, and thus to each and every part regardless of who wrote
-it.
-
-Thus, it is not the intent of this section to claim rights or contest
-your rights to work written entirely by you; rather, the intent is to
-exercise the right to control the distribution of derivative or
-collective works based on the Library.
-
-In addition, mere aggregation of another work not based on the Library
-with the Library (or with a work based on the Library) on a volume of
-a storage or distribution medium does not bring the other work under
-the scope of this License.
-
-  3. You may opt to apply the terms of the ordinary GNU General Public
-License instead of this License to a given copy of the Library.  To do
-this, you must alter all the notices that refer to this License, so
-that they refer to the ordinary GNU General Public License, version 2,
-instead of to this License.  (If a newer version than version 2 of the
-ordinary GNU General Public License has appeared, then you can specify
-that version instead if you wish.)  Do not make any other change in
-these notices.
-
-  Once this change is made in a given copy, it is irreversible for
-that copy, so the ordinary GNU General Public License applies to all
-subsequent copies and derivative works made from that copy.
-
-  This option is useful when you wish to copy part of the code of
-the Library into a program that is not a library.
-
-  4. You may copy and distribute the Library (or a portion or
-derivative of it, under Section 2) in object code or executable form
-under the terms of Sections 1 and 2 above provided that you accompany
-it with the complete corresponding machine-readable source code, which
-must be distributed under the terms of Sections 1 and 2 above on a
-medium customarily used for software interchange.
-
-  If distribution of object code is made by offering access to copy
-from a designated place, then offering equivalent access to copy the
-source code from the same place satisfies the requirement to
-distribute the source code, even though third parties are not
-compelled to copy the source along with the object code.
-
-  5. A program that contains no derivative of any portion of the
-Library, but is designed to work with the Library by being compiled or
-linked with it, is called a "work that uses the Library".  Such a
-work, in isolation, is not a derivative work of the Library, and
-therefore falls outside the scope of this License.
-
-  However, linking a "work that uses the Library" with the Library
-creates an executable that is a derivative of the Library (because it
-contains portions of the Library), rather than a "work that uses the
-library".  The executable is therefore covered by this License.
-Section 6 states terms for distribution of such executables.
-
-  When a "work that uses the Library" uses material from a header file
-that is part of the Library, the object code for the work may be a
-derivative work of the Library even though the source code is not.
-Whether this is true is especially significant if the work can be
-linked without the Library, or if the work is itself a library.  The
-threshold for this to be true is not precisely defined by law.
-
-  If such an object file uses only numerical parameters, data
-structure layouts and accessors, and small macros and small inline
-functions (ten lines or less in length), then the use of the object
-file is unrestricted, regardless of whether it is legally a derivative
-work.  (Executables containing this object code plus portions of the
-Library will still fall under Section 6.)
-
-  Otherwise, if the work is a derivative of the Library, you may
-distribute the object code for the work under the terms of Section 6.
-Any executables containing that work also fall under Section 6,
-whether or not they are linked directly with the Library itself.
-
-  6. As an exception to the Sections above, you may also combine or
-link a "work that uses the Library" with the Library to produce a
-work containing portions of the Library, and distribute that work
-under terms of your choice, provided that the terms permit
-modification of the work for the customer's own use and reverse
-engineering for debugging such modifications.
-
-  You must give prominent notice with each copy of the work that the
-Library is used in it and that the Library and its use are covered by
-this License.  You must supply a copy of this License.  If the work
-during execution displays copyright notices, you must include the
-copyright notice for the Library among them, as well as a reference
-directing the user to the copy of this License.  Also, you must do one
-of these things:
-
-    a) Accompany the work with the complete corresponding
-    machine-readable source code for the Library including whatever
-    changes were used in the work (which must be distributed under
-    Sections 1 and 2 above); and, if the work is an executable linked
-    with the Library, with the complete machine-readable "work that
-    uses the Library", as object code and/or source code, so that the
-    user can modify the Library and then relink to produce a modified
-    executable containing the modified Library.  (It is understood
-    that the user who changes the contents of definitions files in the
-    Library will not necessarily be able to recompile the application
-    to use the modified definitions.)
-
-    b) Use a suitable shared library mechanism for linking with the
-    Library.  A suitable mechanism is one that (1) uses at run time a
-    copy of the library already present on the user's computer system,
-    rather than copying library functions into the executable, and (2)
-    will operate properly with a modified version of the library, if
-    the user installs one, as long as the modified version is
-    interface-compatible with the version that the work was made with.
-
-    c) Accompany the work with a written offer, valid for at
-    least three years, to give the same user the materials
-    specified in Subsection 6a, above, for a charge no more
-    than the cost of performing this distribution.
-
-    d) If distribution of the work is made by offering access to copy
-    from a designated place, offer equivalent access to copy the above
-    specified materials from the same place.
-
-    e) Verify that the user has already received a copy of these
-    materials or that you have already sent this user a copy.
-
-  For an executable, the required form of the "work that uses the
-Library" must include any data and utility programs needed for
-reproducing the executable from it.  However, as a special exception,
-the materials to be distributed need not include anything that is
-normally distributed (in either source or binary form) with the major
-components (compiler, kernel, and so on) of the operating system on
-which the executable runs, unless that component itself accompanies
-the executable.
-
-  It may happen that this requirement contradicts the license
-restrictions of other proprietary libraries that do not normally
-accompany the operating system.  Such a contradiction means you cannot
-use both them and the Library together in an executable that you
-distribute.
-
-  7. You may place library facilities that are a work based on the
-Library side-by-side in a single library together with other library
-facilities not covered by this License, and distribute such a combined
-library, provided that the separate distribution of the work based on
-the Library and of the other library facilities is otherwise
-permitted, and provided that you do these two things:
-
-    a) Accompany the combined library with a copy of the same work
-    based on the Library, uncombined with any other library
-    facilities.  This must be distributed under the terms of the
-    Sections above.
-
-    b) Give prominent notice with the combined library of the fact
-    that part of it is a work based on the Library, and explaining
-    where to find the accompanying uncombined form of the same work.
-
-  8. You may not copy, modify, sublicense, link with, or distribute
-the Library except as expressly provided under this License.  Any
-attempt otherwise to copy, modify, sublicense, link with, or
-distribute the Library is void, and will automatically terminate your
-rights under this License.  However, parties who have received copies,
-or rights, from you under this License will not have their licenses
-terminated so long as such parties remain in full compliance.
-
-  9. You are not required to accept this License, since you have not
-signed it.  However, nothing else grants you permission to modify or
-distribute the Library or its derivative works.  These actions are
-prohibited by law if you do not accept this License.  Therefore, by
-modifying or distributing the Library (or any work based on the
-Library), you indicate your acceptance of this License to do so, and
-all its terms and conditions for copying, distributing or modifying
-the Library or works based on it.
-
-  10. Each time you redistribute the Library (or any work based on the
-Library), the recipient automatically receives a license from the
-original licensor to copy, distribute, link with or modify the Library
-subject to these terms and conditions.  You may not impose any further
-restrictions on the recipients' exercise of the rights granted herein.
-You are not responsible for enforcing compliance by third parties with
-this License.
-
-  11. If, as a consequence of a court judgment or allegation of patent
-infringement or for any other reason (not limited to patent issues),
-conditions are imposed on you (whether by court order, agreement or
-otherwise) that contradict the conditions of this License, they do not
-excuse you from the conditions of this License.  If you cannot
-distribute so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you
-may not distribute the Library at all.  For example, if a patent
-license would not permit royalty-free redistribution of the Library by
-all those who receive copies directly or indirectly through you, then
-the only way you could satisfy both it and this License would be to
-refrain entirely from distribution of the Library.
-
-If any portion of this section is held invalid or unenforceable under any
-particular circumstance, the balance of the section is intended to apply,
-and the section as a whole is intended to apply in other circumstances.
-
-It is not the purpose of this section to induce you to infringe any
-patents or other property right claims or to contest validity of any
-such claims; this section has the sole purpose of protecting the
-integrity of the free software distribution system which is
-implemented by public license practices.  Many people have made
-generous contributions to the wide range of software distributed
-through that system in reliance on consistent application of that
-system; it is up to the author/donor to decide if he or she is willing
-to distribute software through any other system and a licensee cannot
-impose that choice.
-
-This section is intended to make thoroughly clear what is believed to
-be a consequence of the rest of this License.
-
-  12. If the distribution and/or use of the Library is restricted in
-certain countries either by patents or by copyrighted interfaces, the
-original copyright holder who places the Library under this License may add
-an explicit geographical distribution limitation excluding those countries,
-so that distribution is permitted only in or among countries not thus
-excluded.  In such case, this License incorporates the limitation as if
-written in the body of this License.
-
-  13. The Free Software Foundation may publish revised and/or new
-versions of the Lesser General Public License from time to time.
-Such new versions will be similar in spirit to the present version,
-but may differ in detail to address new problems or concerns.
-
-Each version is given a distinguishing version number.  If the Library
-specifies a version number of this License which applies to it and
-"any later version", you have the option of following the terms and
-conditions either of that version or of any later version published by
-the Free Software Foundation.  If the Library does not specify a
-license version number, you may choose any version ever published by
-the Free Software Foundation.
-
-  14. If you wish to incorporate parts of the Library into other free
-programs whose distribution conditions are incompatible with these,
-write to the author to ask for permission.  For software which is
-copyrighted by the Free Software Foundation, write to the Free
-Software Foundation; we sometimes make exceptions for this.  Our
-decision will be guided by the two goals of preserving the free status
-of all derivatives of our free software and of promoting the sharing
-and reuse of software generally.
-
-                            NO WARRANTY
-
-  15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
-WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
-EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
-OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
-KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
-LIBRARY IS WITH YOU.  SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
-THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
-
-  16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
-WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
-AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
-FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
-CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
-LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
-RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
-FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
-SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
-DAMAGES.
-
-                     END OF TERMS AND CONDITIONS
-
-           How to Apply These Terms to Your New Libraries
-
-  If you develop a new library, and you want it to be of the greatest
-possible use to the public, we recommend making it free software that
-everyone can redistribute and change.  You can do so by permitting
-redistribution under these terms (or, alternatively, under the terms of the
-ordinary General Public License).
-
-  To apply these terms, attach the following notices to the library.  It is
-safest to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least the
-"copyright" line and a pointer to where the full notice is found.
-
-    <one line to give the library's name and a brief idea of what it does.>
-    Copyright (C) <year>  <name of author>
-
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Lesser General Public
-    License as published by the Free Software Foundation; either
-    version 2.1 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Lesser General Public License for more details.
-
-    You should have received a copy of the GNU Lesser General Public
-    License along with this library; if not, write to the Free Software
-    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
-
-Also add information on how to contact you by electronic and paper mail.
-
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the library, if
-necessary.  Here is a sample; alter the names:
-
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the
-  library `Frob' (a library for tweaking knobs) written by James Random Hacker.
-
-  <signature of Ty Coon>, 1 April 1990
-  Ty Coon, President of Vice
-
-That's all there is to it!
diff --git a/third_party/undoview/README.chromium b/third_party/undoview/README.chromium
deleted file mode 100644
index 032e2b3..0000000
--- a/third_party/undoview/README.chromium
+++ /dev/null
@@ -1,13 +0,0 @@
-Name: undoview
-Short Name: undoview
-URL: http://projects.gnome.org/gtksourceview, http://www.gtk.org
-Version: unknown
-License: LGPL 2.1
-Security Critical: yes
-
-This directory provides a new class, GtkUndoView. It is based on GtkTextView
-from the GTK+ project, but with undo/redo support added. The code to add this
-support is borrowed from the GtkSourceView project. Since GtkSourceView has a
-lot of other stuff we don't want, we borrow only the undo/redo support and add
-it to GtkTextView to create GtkUndoView.
-
diff --git a/third_party/undoview/undo_manager.c b/third_party/undoview/undo_manager.c
deleted file mode 100644
index 6efba9c..0000000
--- a/third_party/undoview/undo_manager.c
+++ /dev/null
@@ -1,1110 +0,0 @@
-/*
- * Copyright (C) 1998, 1999 Alex Roberts, Evan Lawrence
- * Copyright (C) 2000, 2001 Chema Celorio, Paolo Maggi
- * Copyright (C) 2002-2005 Paolo Maggi
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
-
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <glib.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "undo_manager.h"
-
-#define DEFAULT_MAX_UNDO_LEVELS 25
-
-typedef struct _GtkSourceUndoAction GtkSourceUndoAction;
-typedef struct _GtkSourceUndoInsertAction GtkSourceUndoInsertAction;
-typedef struct _GtkSourceUndoDeleteAction GtkSourceUndoDeleteAction;
-
-typedef enum {
-  GTK_SOURCE_UNDO_ACTION_INSERT,
-  GTK_SOURCE_UNDO_ACTION_DELETE,
-} GtkSourceUndoActionType;
-
-/*
- * We use offsets instead of GtkTextIters because the last ones
- * require to much memory in this context without giving us any advantage.
- */
-
-struct _GtkSourceUndoInsertAction {
-  gint pos;
-  gchar *text;
-  gint length;
-  gint chars;
-};
-
-struct _GtkSourceUndoDeleteAction {
-  gint start;
-  gint end;
-  gchar *text;
-  gboolean forward;
-};
-
-struct _GtkSourceUndoAction {
-  GtkSourceUndoActionType action_type;
-
-  union {
-    GtkSourceUndoInsertAction insert;
-    GtkSourceUndoDeleteAction delete;
-  } action;
-
-  gint order_in_group;
-
-  /* It is TRUE whether the action can be merged with the following action. */
-  guint mergeable : 1;
-
-  /* It is TRUE whether the action is marked as "modified".
-   * An action is marked as "modified" if it changed the
-   * state of the buffer from "not modified" to "modified". Only the first
-   * action of a group can be marked as modified.
-   * There can be a single action marked as "modified" in the actions list.
-   */
-  guint modified : 1;
-};
-
-/* INVALID is a pointer to an invalid action */
-#define INVALID ((void *) "IA")
-
-struct _GtkSourceUndoManagerPrivate {
-  GtkTextBuffer *document;
-
-  GList* actions;
-  gint next_redo;
-
-  gint actions_in_current_group;
-
-  gint running_not_undoable_actions;
-
-  gint num_of_groups;
-
-  gint max_undo_levels;
-
-  guint can_undo : 1;
-  guint can_redo : 1;
-
-  /* It is TRUE whether, while undoing an action of the current group (with order_in_group > 1),
-   * the state of the buffer changed from "not modified" to "modified".
-   */
-  guint modified_undoing_group : 1;
-
-  /* Pointer to the action (in the action list) marked as "modified".
-   * It is NULL when no action is marked as "modified".
-   * It is INVALID when the action marked as "modified" has been removed
-   * from the action list (freeing the list or resizing it) */
-  GtkSourceUndoAction *modified_action;
-};
-
-enum {
-  CAN_UNDO,
-  CAN_REDO,
-  LAST_SIGNAL
-};
-
-#if !defined(NDEBUG)
-static void
-print_state(GtkSourceUndoManager* um)
-{
-  fprintf(stderr, "\n***\n");
-  GList* actions = um->priv->actions;
-
-  for (; actions; actions = g_list_next(actions)) {
-    GtkSourceUndoAction* act = actions->data;
-    fprintf(stderr, "* type = %s\n", act->action_type == GTK_SOURCE_UNDO_ACTION_DELETE ?
-        "delete" : "insert");
-
-    fprintf(stderr, "\ttext = %s\n", act->action_type == GTK_SOURCE_UNDO_ACTION_DELETE
-        ? act->action.delete.text : act->action.insert.text);
-    fprintf(stderr, "\torder = %d\n", act->order_in_group);
-  }
-
-  fprintf(stderr, "* next redo: %d\n", um->priv->next_redo);
-  fprintf(stderr, "* num of groups: %d\n", um->priv->num_of_groups);
-  fprintf(stderr, "* actions in group: %d\n", um->priv->actions_in_current_group);
-}
-#endif
-
-static void gtk_source_undo_manager_class_init(GtkSourceUndoManagerClass *klass);
-static void gtk_source_undo_manager_init(GtkSourceUndoManager *um);
-static void gtk_source_undo_manager_finalize(GObject *object);
-
-static void gtk_source_undo_manager_insert_text_handler(GtkTextBuffer *buffer,
-                  GtkTextIter *pos,
-                                         const gchar *text,
-                  gint length,
-                  GtkSourceUndoManager *um);
-static void gtk_source_undo_manager_delete_range_handler(GtkTextBuffer *buffer,
-                  GtkTextIter *start,
-                                          GtkTextIter *end,
-                  GtkSourceUndoManager *um);
-static void gtk_source_undo_manager_begin_user_action_handler(GtkTextBuffer *buffer,
-                 GtkSourceUndoManager *um);
-static void gtk_source_undo_manager_modified_changed_handler(GtkTextBuffer *buffer,
-                 GtkSourceUndoManager *um);
-
-static void gtk_source_undo_manager_free_action_list(GtkSourceUndoManager *um);
-
-static void gtk_source_undo_manager_add_action(GtkSourceUndoManager *um,
-                                                const GtkSourceUndoAction *undo_action);
-static void gtk_source_undo_manager_free_first_n_actions(GtkSourceUndoManager *um,
-                 gint n);
-static void gtk_source_undo_manager_check_list_size(GtkSourceUndoManager *um);
-
-static gboolean gtk_source_undo_manager_merge_action(GtkSourceUndoManager *um,
-                                               const GtkSourceUndoAction *undo_action);
-
-static GObjectClass *parent_class = NULL;
-static guint undo_manager_signals [LAST_SIGNAL] = { 0 };
-
-GType
-gtk_source_undo_manager_get_type(void) {
-  static GType undo_manager_type = 0;
-
-    if(undo_manager_type == 0)
-      {
-          static const GTypeInfo our_info =
-          {
-            sizeof(GtkSourceUndoManagerClass),
-            NULL, /* base_init */
-            NULL, /* base_finalize */
-            (GClassInitFunc) gtk_source_undo_manager_class_init,
-            NULL, /* class_finalize */
-            NULL, /* class_data */
-            sizeof(GtkSourceUndoManager),
-            0, /* n_preallocs */
-            (GInstanceInitFunc) gtk_source_undo_manager_init,
-            NULL /* value_table */
-          };
-
-          undo_manager_type = g_type_register_static(G_TYPE_OBJECT,
-              "GtkSourceUndoManager",
-              &our_info,
-              0);
-      }
-
-  return undo_manager_type;
-}
-
-static void
-gtk_source_undo_manager_class_init(GtkSourceUndoManagerClass *klass) {
-  GObjectClass *object_class = G_OBJECT_CLASS(klass);
-
-  parent_class = g_type_class_peek_parent(klass);
-
-  object_class->finalize = gtk_source_undo_manager_finalize;
-
-  klass->can_undo = NULL;
-  klass->can_redo = NULL;
-
-  undo_manager_signals[CAN_UNDO] =
-       g_signal_new("can_undo",
-            G_OBJECT_CLASS_TYPE(object_class),
-            G_SIGNAL_RUN_LAST,
-            G_STRUCT_OFFSET(GtkSourceUndoManagerClass, can_undo),
-            NULL, NULL,
-            g_cclosure_marshal_VOID__BOOLEAN,
-            G_TYPE_NONE,
-            1,
-            G_TYPE_BOOLEAN);
-
-  undo_manager_signals[CAN_REDO] =
-       g_signal_new("can_redo",
-            G_OBJECT_CLASS_TYPE(object_class),
-            G_SIGNAL_RUN_LAST,
-            G_STRUCT_OFFSET(GtkSourceUndoManagerClass, can_redo),
-            NULL, NULL,
-            g_cclosure_marshal_VOID__BOOLEAN,
-            G_TYPE_NONE,
-            1,
-            G_TYPE_BOOLEAN);
-}
-
-static void
-gtk_source_undo_manager_init(GtkSourceUndoManager *um) {
-  um->priv = g_new0(GtkSourceUndoManagerPrivate, 1);
-
-  um->priv->actions = NULL;
-  um->priv->next_redo = 0;
-
-  um->priv->can_undo = FALSE;
-  um->priv->can_redo = FALSE;
-
-  um->priv->running_not_undoable_actions = 0;
-
-  um->priv->num_of_groups = 0;
-
-  um->priv->max_undo_levels = DEFAULT_MAX_UNDO_LEVELS;
-
-  um->priv->modified_action = NULL;
-
-  um->priv->modified_undoing_group = FALSE;
-}
-
-static void
-gtk_source_undo_manager_finalize(GObject *object) {
-  GtkSourceUndoManager *um;
-
-  g_return_if_fail(object != NULL);
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(object));
-
-  um = GTK_SOURCE_UNDO_MANAGER(object);
-
-  g_return_if_fail(um->priv != NULL);
-
-  if(um->priv->actions != NULL)
-    gtk_source_undo_manager_free_action_list(um);
-
-  g_signal_handlers_disconnect_by_func(G_OBJECT(um->priv->document),
-        G_CALLBACK(gtk_source_undo_manager_delete_range_handler),
-        um);
-
-  g_signal_handlers_disconnect_by_func(G_OBJECT(um->priv->document),
-        G_CALLBACK(gtk_source_undo_manager_insert_text_handler),
-        um);
-
-  g_signal_handlers_disconnect_by_func(G_OBJECT(um->priv->document),
-        G_CALLBACK(gtk_source_undo_manager_begin_user_action_handler),
-        um);
-
-  g_signal_handlers_disconnect_by_func(G_OBJECT(um->priv->document),
-        G_CALLBACK(gtk_source_undo_manager_modified_changed_handler),
-        um);
-
-  g_free(um->priv);
-
-  G_OBJECT_CLASS(parent_class)->finalize(object);
-}
-
-GtkSourceUndoManager*
-gtk_source_undo_manager_new(GtkTextBuffer* buffer) {
-  GtkSourceUndoManager *um;
-
-  um = GTK_SOURCE_UNDO_MANAGER(g_object_new(GTK_SOURCE_TYPE_UNDO_MANAGER, NULL));
-
-  g_return_val_if_fail(um->priv != NULL, NULL);
-  um->priv->document = buffer;
-
-  g_signal_connect(G_OBJECT(buffer), "insert_text",
-        G_CALLBACK(gtk_source_undo_manager_insert_text_handler),
-        um);
-
-  g_signal_connect(G_OBJECT(buffer), "delete_range",
-        G_CALLBACK(gtk_source_undo_manager_delete_range_handler),
-        um);
-
-  g_signal_connect(G_OBJECT(buffer), "begin_user_action",
-        G_CALLBACK(gtk_source_undo_manager_begin_user_action_handler),
-        um);
-
-  g_signal_connect(G_OBJECT(buffer), "modified_changed",
-        G_CALLBACK(gtk_source_undo_manager_modified_changed_handler),
-        um);
-  return um;
-}
-
-void
-gtk_source_undo_manager_begin_not_undoable_action(GtkSourceUndoManager *um) {
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-
-  ++um->priv->running_not_undoable_actions;
-}
-
-static void
-gtk_source_undo_manager_end_not_undoable_action_internal(GtkSourceUndoManager *um) {
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-
-  g_return_if_fail(um->priv->running_not_undoable_actions > 0);
-
-  --um->priv->running_not_undoable_actions;
-}
-
-void
-gtk_source_undo_manager_end_not_undoable_action(GtkSourceUndoManager *um) {
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-
-  gtk_source_undo_manager_end_not_undoable_action_internal(um);
-
-  if(um->priv->running_not_undoable_actions == 0)
-  {
-    gtk_source_undo_manager_free_action_list(um);
-
-    um->priv->next_redo = -1;
-
-    if(um->priv->can_undo)
-    {
-      um->priv->can_undo = FALSE;
-      g_signal_emit(G_OBJECT(um),
-               undo_manager_signals [CAN_UNDO],
-               0,
-               FALSE);
-    }
-
-    if(um->priv->can_redo)
-    {
-      um->priv->can_redo = FALSE;
-      g_signal_emit(G_OBJECT(um),
-               undo_manager_signals [CAN_REDO],
-               0,
-               FALSE);
-    }
-  }
-}
-
-gboolean
-gtk_source_undo_manager_can_undo(const GtkSourceUndoManager *um) {
-  g_return_val_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um), FALSE);
-  g_return_val_if_fail(um->priv != NULL, FALSE);
-
-  return um->priv->can_undo;
-}
-
-gboolean
-gtk_source_undo_manager_can_redo(const GtkSourceUndoManager *um) {
-  g_return_val_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um), FALSE);
-  g_return_val_if_fail(um->priv != NULL, FALSE);
-
-  return um->priv->can_redo;
-}
-
-static void
-set_cursor(GtkTextBuffer *buffer, gint cursor) {
-  GtkTextIter iter;
-
-  /* Place the cursor at the requested position */
-  gtk_text_buffer_get_iter_at_offset(buffer, &iter, cursor);
-  gtk_text_buffer_place_cursor(buffer, &iter);
-}
-
-static void
-insert_text(GtkTextBuffer *buffer, gint pos, const gchar *text, gint len) {
-  GtkTextIter iter;
-
-  gtk_text_buffer_get_iter_at_offset(buffer, &iter, pos);
-  gtk_text_buffer_insert(buffer, &iter, text, len);
-}
-
-static void
-delete_text(GtkTextBuffer *buffer, gint start, gint end) {
-  GtkTextIter start_iter;
-  GtkTextIter end_iter;
-
-  gtk_text_buffer_get_iter_at_offset(buffer, &start_iter, start);
-
-  if(end < 0)
-    gtk_text_buffer_get_end_iter(buffer, &end_iter);
-  else
-    gtk_text_buffer_get_iter_at_offset(buffer, &end_iter, end);
-
-  gtk_text_buffer_delete(buffer, &start_iter, &end_iter);
-}
-
-static gchar*
-get_chars(GtkTextBuffer *buffer, gint start, gint end) {
-  GtkTextIter start_iter;
-  GtkTextIter end_iter;
-
-  gtk_text_buffer_get_iter_at_offset(buffer, &start_iter, start);
-
-  if(end < 0)
-    gtk_text_buffer_get_end_iter(buffer, &end_iter);
-  else
-    gtk_text_buffer_get_iter_at_offset(buffer, &end_iter, end);
-
-  return gtk_text_buffer_get_slice(buffer, &start_iter, &end_iter, TRUE);
-}
-
-void
-gtk_source_undo_manager_undo(GtkSourceUndoManager *um) {
-  GtkSourceUndoAction *undo_action;
-  gboolean modified = FALSE;
-
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-  g_return_if_fail(um->priv->can_undo);
-
-  um->priv->modified_undoing_group = FALSE;
-
-  gtk_source_undo_manager_begin_not_undoable_action(um);
-
-  do
-  {
-    undo_action = g_list_nth_data(um->priv->actions, um->priv->next_redo + 1);
-    g_return_if_fail(undo_action != NULL);
-
-    /* undo_action->modified can be TRUE only if undo_action->order_in_group <= 1 */
-    g_return_if_fail((undo_action->order_in_group <= 1) ||
-        ((undo_action->order_in_group > 1) && !undo_action->modified));
-
-    if(undo_action->order_in_group <= 1)
-    {
-      /* Set modified to TRUE only if the buffer did not change its state from
-       * "not modified" to "modified" undoing an action(with order_in_group > 1)
-       * in current group. */
-      modified =(undo_action->modified && !um->priv->modified_undoing_group);
-    }
-
-    switch(undo_action->action_type)
-    {
-      case GTK_SOURCE_UNDO_ACTION_DELETE:
-        insert_text(
-          um->priv->document,
-          undo_action->action.delete.start,
-          undo_action->action.delete.text,
-          strlen(undo_action->action.delete.text));
-
-        if(undo_action->action.delete.forward)
-          set_cursor(
-            um->priv->document,
-            undo_action->action.delete.start);
-        else
-          set_cursor(
-            um->priv->document,
-            undo_action->action.delete.end);
-
-        break;
-
-      case GTK_SOURCE_UNDO_ACTION_INSERT:
-        delete_text(
-          um->priv->document,
-          undo_action->action.insert.pos,
-          undo_action->action.insert.pos +
-            undo_action->action.insert.chars);
-
-        set_cursor(
-          um->priv->document,
-          undo_action->action.insert.pos);
-        break;
-
-      default:
-        /* Unknown action type. */
-        g_return_if_reached();
-    }
-
-    ++um->priv->next_redo;
-
-  } while(undo_action->order_in_group > 1);
-
-  if(modified)
-  {
-    --um->priv->next_redo;
-    gtk_text_buffer_set_modified(um->priv->document, FALSE);
-    ++um->priv->next_redo;
-  }
-
-  gtk_source_undo_manager_end_not_undoable_action_internal(um);
-
-  um->priv->modified_undoing_group = FALSE;
-
-  if(!um->priv->can_redo)
-  {
-    um->priv->can_redo = TRUE;
-    g_signal_emit(G_OBJECT(um),
-             undo_manager_signals [CAN_REDO],
-             0,
-             TRUE);
-  }
-
-  if(um->priv->next_redo >=(gint)(g_list_length(um->priv->actions) - 1))
-  {
-    um->priv->can_undo = FALSE;
-    g_signal_emit(G_OBJECT(um),
-             undo_manager_signals [CAN_UNDO],
-             0,
-             FALSE);
-  }
-}
-
-void
-gtk_source_undo_manager_redo(GtkSourceUndoManager *um) {
-  GtkSourceUndoAction *undo_action;
-  gboolean modified = FALSE;
-
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-  g_return_if_fail(um->priv->can_redo);
-
-  undo_action = g_list_nth_data(um->priv->actions, um->priv->next_redo);
-  g_return_if_fail(undo_action != NULL);
-
-  gtk_source_undo_manager_begin_not_undoable_action(um);
-
-  do
-  {
-    if(undo_action->modified)
-    {
-      g_return_if_fail(undo_action->order_in_group <= 1);
-      modified = TRUE;
-    }
-
-    --um->priv->next_redo;
-
-    switch(undo_action->action_type)
-    {
-      case GTK_SOURCE_UNDO_ACTION_DELETE:
-        delete_text(
-          um->priv->document,
-          undo_action->action.delete.start,
-          undo_action->action.delete.end);
-
-        set_cursor(
-          um->priv->document,
-          undo_action->action.delete.start);
-
-        break;
-
-      case GTK_SOURCE_UNDO_ACTION_INSERT:
-        set_cursor(
-          um->priv->document,
-          undo_action->action.insert.pos);
-
-        insert_text(
-          um->priv->document,
-          undo_action->action.insert.pos,
-          undo_action->action.insert.text,
-          undo_action->action.insert.length);
-
-        break;
-
-      default:
-        /* Unknown action type */
-        ++um->priv->next_redo;
-        g_return_if_reached();
-    }
-
-    if(um->priv->next_redo < 0)
-      undo_action = NULL;
-    else
-      undo_action = g_list_nth_data(um->priv->actions, um->priv->next_redo);
-
-  } while((undo_action != NULL) &&(undo_action->order_in_group > 1));
-
-  if(modified)
-  {
-    ++um->priv->next_redo;
-    gtk_text_buffer_set_modified(um->priv->document, FALSE);
-    --um->priv->next_redo;
-  }
-
-  gtk_source_undo_manager_end_not_undoable_action_internal(um);
-
-  if(um->priv->next_redo < 0)
-  {
-    um->priv->can_redo = FALSE;
-    g_signal_emit(G_OBJECT(um), undo_manager_signals [CAN_REDO], 0, FALSE);
-  }
-
-  if(!um->priv->can_undo)
-  {
-    um->priv->can_undo = TRUE;
-    g_signal_emit(G_OBJECT(um), undo_manager_signals [CAN_UNDO], 0, TRUE);
-  }
-}
-
-static void
-gtk_source_undo_action_free(GtkSourceUndoAction *action) {
-  if(action == NULL)
-    return;
-
-  if(action->action_type == GTK_SOURCE_UNDO_ACTION_INSERT)
-    g_free(action->action.insert.text);
-  else if(action->action_type == GTK_SOURCE_UNDO_ACTION_DELETE)
-    g_free(action->action.delete.text);
-  else
-    g_return_if_reached();
-
-  g_free(action);
-}
-
-static void
-gtk_source_undo_manager_free_action_list(GtkSourceUndoManager *um) {
-  GList *l;
-
-  l = um->priv->actions;
-
-  while(l != NULL)
-  {
-    GtkSourceUndoAction *action = l->data;
-
-    if(action->order_in_group == 1)
-      --um->priv->num_of_groups;
-    um->priv->actions_in_current_group = action->order_in_group - 1;
-
-    if(action->modified)
-      um->priv->modified_action = INVALID;
-
-    gtk_source_undo_action_free(action);
-
-    l = g_list_next(l);
-  }
-
-  g_list_free(um->priv->actions);
-  um->priv->actions = NULL;
-}
-
-static void
-gtk_source_undo_manager_insert_text_handler(GtkTextBuffer *buffer,
-    GtkTextIter *pos,
-    const gchar *text,
-    gint length,
-    GtkSourceUndoManager *um) {
-  GtkSourceUndoAction undo_action;
-
-  if(um->priv->running_not_undoable_actions > 0)
-    return;
-
-  undo_action.action_type = GTK_SOURCE_UNDO_ACTION_INSERT;
-
-  undo_action.action.insert.pos = gtk_text_iter_get_offset(pos);
-  undo_action.action.insert.text =(gchar*) text;
-  undo_action.action.insert.length = length;
-  undo_action.action.insert.chars = g_utf8_strlen(text, length);
-
-  if((undo_action.action.insert.chars > 1) ||(g_utf8_get_char(text) == '\n'))
-
-           undo_action.mergeable = FALSE;
-  else
-    undo_action.mergeable = TRUE;
-
-  undo_action.modified = FALSE;
-
-  gtk_source_undo_manager_add_action(um, &undo_action);
-}
-
-static void
-gtk_source_undo_manager_delete_range_handler(GtkTextBuffer *buffer,
-    GtkTextIter *start,
-    GtkTextIter *end,
-    GtkSourceUndoManager *um) {
-  GtkSourceUndoAction undo_action;
-  GtkTextIter insert_iter;
-
-  if(um->priv->running_not_undoable_actions > 0)
-    return;
-
-  undo_action.action_type = GTK_SOURCE_UNDO_ACTION_DELETE;
-
-  gtk_text_iter_order(start, end);
-
-  undo_action.action.delete.start = gtk_text_iter_get_offset(start);
-  undo_action.action.delete.end = gtk_text_iter_get_offset(end);
-
-  undo_action.action.delete.text = get_chars(
-            buffer,
-            undo_action.action.delete.start,
-            undo_action.action.delete.end);
-
-  /* figure out if the user used the Delete or the Backspace key */
-  gtk_text_buffer_get_iter_at_mark(buffer, &insert_iter,
-            gtk_text_buffer_get_insert(buffer));
-  if(gtk_text_iter_get_offset(&insert_iter) <= undo_action.action.delete.start)
-    undo_action.action.delete.forward = TRUE;
-  else
-    undo_action.action.delete.forward = FALSE;
-
-  if(((undo_action.action.delete.end - undo_action.action.delete.start) > 1) ||
-      (g_utf8_get_char(undo_action.action.delete.text ) == '\n'))
-           undo_action.mergeable = FALSE;
-  else
-    undo_action.mergeable = TRUE;
-
-  undo_action.modified = FALSE;
-
-  gtk_source_undo_manager_add_action(um, &undo_action);
-
-  g_free(undo_action.action.delete.text);
-
-}
-
-static void
-gtk_source_undo_manager_begin_user_action_handler(GtkTextBuffer *buffer, GtkSourceUndoManager *um) {
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-
-  if(um->priv->running_not_undoable_actions > 0)
-    return;
-
-  um->priv->actions_in_current_group = 0;
-}
-
-static void
-gtk_source_undo_manager_add_action(GtkSourceUndoManager *um,
-            const GtkSourceUndoAction *undo_action) {
-  GtkSourceUndoAction* action;
-
-  if(um->priv->next_redo >= 0)
-  {
-    gtk_source_undo_manager_free_first_n_actions(um, um->priv->next_redo + 1);
-  }
-
-  um->priv->next_redo = -1;
-
-  if(!gtk_source_undo_manager_merge_action(um, undo_action))
-  {
-    action = g_new(GtkSourceUndoAction, 1);
-    *action = *undo_action;
-
-    if(action->action_type == GTK_SOURCE_UNDO_ACTION_INSERT)
-      action->action.insert.text = g_strndup(undo_action->action.insert.text, undo_action->action.insert.length);
-    else if(action->action_type == GTK_SOURCE_UNDO_ACTION_DELETE)
-      action->action.delete.text = g_strdup(undo_action->action.delete.text);
-    else
-    {
-      g_free(action);
-      g_return_if_reached();
-    }
-
-    ++um->priv->actions_in_current_group;
-    action->order_in_group = um->priv->actions_in_current_group;
-
-    if(action->order_in_group == 1)
-      ++um->priv->num_of_groups;
-
-    um->priv->actions = g_list_prepend(um->priv->actions, action);
-  }
-
-  gtk_source_undo_manager_check_list_size(um);
-
-  if(!um->priv->can_undo)
-  {
-    um->priv->can_undo = TRUE;
-    g_signal_emit(G_OBJECT(um), undo_manager_signals [CAN_UNDO], 0, TRUE);
-  }
-
-  if(um->priv->can_redo)
-  {
-    um->priv->can_redo = FALSE;
-    g_signal_emit(G_OBJECT(um), undo_manager_signals [CAN_REDO], 0, FALSE);
-  }
-}
-
-static void
-gtk_source_undo_manager_free_first_n_actions(GtkSourceUndoManager *um,
-                gint n) {
-  gint i;
-
-  if(um->priv->actions == NULL)
-    return;
-
-  for(i = 0; i < n; i++)
-  {
-    GtkSourceUndoAction *action = g_list_first(um->priv->actions)->data;
-
-    if(action->order_in_group == 1)
-      --um->priv->num_of_groups;
-    um->priv->actions_in_current_group = action->order_in_group - 1;
-
-    if(action->modified)
-      um->priv->modified_action = INVALID;
-
-    gtk_source_undo_action_free(action);
-
-    um->priv->actions = g_list_delete_link(um->priv->actions,
-              um->priv->actions);
-
-    if(um->priv->actions == NULL)
-      return;
-  }
-}
-
-static void
-gtk_source_undo_manager_check_list_size(GtkSourceUndoManager *um) {
-  gint undo_levels;
-
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-
-  undo_levels = gtk_source_undo_manager_get_max_undo_levels(um);
-
-  if(undo_levels < 1)
-    return;
-
-  if(um->priv->num_of_groups > undo_levels)
-  {
-    GtkSourceUndoAction *undo_action;
-    GList *last;
-
-    last = g_list_last(um->priv->actions);
-    undo_action =(GtkSourceUndoAction*) last->data;
-
-    do
-    {
-      GList *tmp;
-
-      if(undo_action->order_in_group == 1)
-        --um->priv->num_of_groups;
-      um->priv->actions_in_current_group = undo_action->order_in_group - 1;
-
-      if(undo_action->modified)
-        um->priv->modified_action = INVALID;
-
-      gtk_source_undo_action_free(undo_action);
-
-      tmp = g_list_previous(last);
-      um->priv->actions = g_list_delete_link(um->priv->actions, last);
-      last = tmp;
-      g_return_if_fail(last != NULL);
-
-      undo_action =(GtkSourceUndoAction*) last->data;
-
-    } while((undo_action->order_in_group > 1) ||
-      (um->priv->num_of_groups > undo_levels));
-  }
-}
-
-/**
- * gtk_source_undo_manager_merge_action:
- * @um: a #GtkSourceUndoManager.
- * @undo_action: a #GtkSourceUndoAction.
- *
- * This function tries to merge the undo action at the top of
- * the stack with a new undo action. So when we undo for example
- * typing, we can undo the whole word and not each letter by itself.
- *
- * Return Value: %TRUE is merge was successful, %FALSE otherwise.
- **/
-static gboolean
-gtk_source_undo_manager_merge_action(GtkSourceUndoManager *um,
-              const GtkSourceUndoAction *undo_action) {
-  GtkSourceUndoAction *last_action;
-
-  g_return_val_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um), FALSE);
-  g_return_val_if_fail(um->priv != NULL, FALSE);
-
-  if(um->priv->actions == NULL)
-    return FALSE;
-
-  last_action =(GtkSourceUndoAction*) g_list_nth_data(um->priv->actions, 0);
-
-  if(!last_action->mergeable)
-    return FALSE;
-
-  if((!undo_action->mergeable) ||
-     (undo_action->action_type != last_action->action_type))
-  {
-    last_action->mergeable = FALSE;
-    return FALSE;
-  }
-
-  if(undo_action->action_type == GTK_SOURCE_UNDO_ACTION_DELETE)
-  {
-    if((last_action->action.delete.forward != undo_action->action.delete.forward) ||
-       ((last_action->action.delete.start != undo_action->action.delete.start) &&
-        (last_action->action.delete.start != undo_action->action.delete.end)))
-    {
-      last_action->mergeable = FALSE;
-      return FALSE;
-    }
-
-    if(last_action->action.delete.start == undo_action->action.delete.start)
-    {
-      gchar *str;
-
-#define L (last_action->action.delete.end - last_action->action.delete.start - 1)
-#define g_utf8_get_char_at(p,i) g_utf8_get_char(g_utf8_offset_to_pointer((p),(i)))
-
-      /* Deleted with the delete key */
-      if((g_utf8_get_char(undo_action->action.delete.text) != ' ') &&
-         (g_utf8_get_char(undo_action->action.delete.text) != '\t') &&
-                           ((g_utf8_get_char_at(last_action->action.delete.text, L) == ' ') ||
-          (g_utf8_get_char_at(last_action->action.delete.text, L) == '\t')))
-      {
-        last_action->mergeable = FALSE;
-        return FALSE;
-      }
-
-      str = g_strdup_printf("%s%s", last_action->action.delete.text,
-        undo_action->action.delete.text);
-
-      g_free(last_action->action.delete.text);
-      last_action->action.delete.end +=(undo_action->action.delete.end -
-                 undo_action->action.delete.start);
-      last_action->action.delete.text = str;
-    }
-    else
-    {
-      gchar *str;
-
-      /* Deleted with the backspace key */
-      if((g_utf8_get_char(undo_action->action.delete.text) != ' ') &&
-         (g_utf8_get_char(undo_action->action.delete.text) != '\t') &&
-                           ((g_utf8_get_char(last_action->action.delete.text) == ' ') ||
-          (g_utf8_get_char(last_action->action.delete.text) == '\t')))
-      {
-        last_action->mergeable = FALSE;
-        return FALSE;
-      }
-
-      str = g_strdup_printf("%s%s", undo_action->action.delete.text,
-        last_action->action.delete.text);
-
-      g_free(last_action->action.delete.text);
-      last_action->action.delete.start = undo_action->action.delete.start;
-      last_action->action.delete.text = str;
-    }
-  }
-  else if(undo_action->action_type == GTK_SOURCE_UNDO_ACTION_INSERT)
-  {
-    gchar* str;
-
-#define I (last_action->action.insert.chars - 1)
-
-    if((undo_action->action.insert.pos !=
-          (last_action->action.insert.pos + last_action->action.insert.chars)) ||
-       ((g_utf8_get_char(undo_action->action.insert.text) != ' ') &&
-         (g_utf8_get_char(undo_action->action.insert.text) != '\t') &&
-        ((g_utf8_get_char_at(last_action->action.insert.text, I) == ' ') ||
-         (g_utf8_get_char_at(last_action->action.insert.text, I) == '\t')))
-       )
-    {
-      last_action->mergeable = FALSE;
-      return FALSE;
-    }
-
-    str = g_strdup_printf("%s%s", last_action->action.insert.text,
-        undo_action->action.insert.text);
-
-    g_free(last_action->action.insert.text);
-    last_action->action.insert.length += undo_action->action.insert.length;
-    last_action->action.insert.text = str;
-    last_action->action.insert.chars += undo_action->action.insert.chars;
-
-  }
-  else
-    /* Unknown action inside undo merge encountered */
-    g_return_val_if_reached(TRUE);
-
-  return TRUE;
-}
-
-gint
-gtk_source_undo_manager_get_max_undo_levels(GtkSourceUndoManager *um) {
-  g_return_val_if_fail(um != NULL, 0);
-  g_return_val_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um), 0);
-
-  return um->priv->max_undo_levels;
-}
-
-void
-gtk_source_undo_manager_set_max_undo_levels(GtkSourceUndoManager *um,
-                 gint max_undo_levels) {
-  gint old_levels;
-
-  g_return_if_fail(um != NULL);
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-
-  old_levels = um->priv->max_undo_levels;
-  um->priv->max_undo_levels = max_undo_levels;
-
-  if(max_undo_levels < 1)
-    return;
-
-  if(old_levels > max_undo_levels)
-  {
-    /* strip redo actions first */
-    while(um->priv->next_redo >= 0 &&(um->priv->num_of_groups > max_undo_levels))
-    {
-      gtk_source_undo_manager_free_first_n_actions(um, 1);
-      um->priv->next_redo--;
-    }
-
-    /* now remove undo actions if necessary */
-    gtk_source_undo_manager_check_list_size(um);
-
-    /* emit "can_undo" and/or "can_redo" if appropiate */
-    if(um->priv->next_redo < 0 && um->priv->can_redo)
-    {
-      um->priv->can_redo = FALSE;
-      g_signal_emit(G_OBJECT(um), undo_manager_signals [CAN_REDO], 0, FALSE);
-    }
-
-    if(um->priv->can_undo &&
-        um->priv->next_redo >=(gint)(g_list_length(um->priv->actions) - 1))
-    {
-      um->priv->can_undo = FALSE;
-      g_signal_emit(G_OBJECT(um), undo_manager_signals [CAN_UNDO], 0, FALSE);
-    }
-  }
-}
-
-static void
-gtk_source_undo_manager_modified_changed_handler(GtkTextBuffer *buffer,
-                                                GtkSourceUndoManager *um) {
-  GtkSourceUndoAction *action;
-  GList *list;
-
-  g_return_if_fail(GTK_SOURCE_IS_UNDO_MANAGER(um));
-  g_return_if_fail(um->priv != NULL);
-
-  if(um->priv->actions == NULL)
-    return;
-
-  list = g_list_nth(um->priv->actions, um->priv->next_redo + 1);
-
-  if(list != NULL)
-    action =(GtkSourceUndoAction*) list->data;
-  else
-    action = NULL;
-
-  if(gtk_text_buffer_get_modified(buffer) == FALSE)
-  {
-    if(action != NULL)
-      action->mergeable = FALSE;
-
-    if(um->priv->modified_action != NULL)
-    {
-      if(um->priv->modified_action != INVALID)
-        um->priv->modified_action->modified = FALSE;
-
-      um->priv->modified_action = NULL;
-    }
-
-    return;
-  }
-
-  if(action == NULL)
-  {
-    g_return_if_fail(um->priv->running_not_undoable_actions > 0);
-
-    return;
-  }
-
-  /* gtk_text_buffer_get_modified(buffer) == TRUE */
-
-  g_return_if_fail(um->priv->modified_action == NULL);
-
-  if(action->order_in_group > 1)
-    um->priv->modified_undoing_group = TRUE;
-
-  while(action->order_in_group > 1)
-  {
-    list = g_list_next(list);
-    g_return_if_fail(list != NULL);
-
-    action =(GtkSourceUndoAction*) list->data;
-    g_return_if_fail(action != NULL);
-  }
-
-  action->modified = TRUE;
-  um->priv->modified_action = action;
-}
-
diff --git a/third_party/undoview/undo_manager.h b/third_party/undoview/undo_manager.h
deleted file mode 100644
index 5a18829..0000000
--- a/third_party/undoview/undo_manager.h
+++ /dev/null
@@ -1,86 +0,0 @@
-/*
- * Copyright (C) 1998, 1999 Alex Roberts, Evan Lawrence
- * Copyright (C) 2000, 2001 Chema Celorio, Paolo Maggi
- * Copyright (C) 2002, 2003 Paolo Maggi
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
-
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- */
-
-#ifndef UNDOVIEW_UNDO_MANAGER_H_
-#define UNDOVIEW_UNDO_MANAGER_H_
-
-#include <gtk/gtk.h>
-
-G_BEGIN_DECLS
-
-#define GTK_SOURCE_TYPE_UNDO_MANAGER            (gtk_source_undo_manager_get_type())
-
-#define GTK_SOURCE_UNDO_MANAGER(obj)            \
-  (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_SOURCE_TYPE_UNDO_MANAGER, GtkSourceUndoManager))
-
-#define GTK_SOURCE_UNDO_MANAGER_CLASS(klass)    \
-  (G_TYPE_CHECK_CLASS_CAST((klass), GTK_SOURCE_TYPE_UNDO_MANAGER, GtkSourceUndoManagerClass))
-
-#define GTK_SOURCE_IS_UNDO_MANAGER(obj)         \
-  (G_TYPE_CHECK_INSTANCE_TYPE((obj), GTK_SOURCE_TYPE_UNDO_MANAGER))
-
-#define GTK_SOURCE_IS_UNDO_MANAGER_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_TYPE((klass), GTK_SOURCE_TYPE_UNDO_MANAGER))
-
-#define GTK_SOURCE_UNDO_MANAGER_GET_CLASS(obj)  \
-  (G_TYPE_INSTANCE_GET_CLASS((obj), GTK_SOURCE_TYPE_UNDO_MANAGER, GtkSourceUndoManagerClass))
-
-typedef struct _GtkSourceUndoManager          GtkSourceUndoManager;
-typedef struct _GtkSourceUndoManagerClass   GtkSourceUndoManagerClass;
-
-typedef struct _GtkSourceUndoManagerPrivate   GtkSourceUndoManagerPrivate;
-
-struct _GtkSourceUndoManager
-{
-  GObject base;
-
-  GtkSourceUndoManagerPrivate *priv;
-};
-
-struct _GtkSourceUndoManagerClass
-{
-  GObjectClass parent_class;
-
-  /* Signals */
-  void (*can_undo)(GtkSourceUndoManager *um, gboolean can_undo);
-  void (*can_redo)(GtkSourceUndoManager *um, gboolean can_redo);
-};
-
-GType            gtk_source_undo_manager_get_type(void) G_GNUC_CONST;
-
-GtkSourceUndoManager*   gtk_source_undo_manager_new(GtkTextBuffer     *buffer);
-
-gboolean    gtk_source_undo_manager_can_undo(const GtkSourceUndoManager *um);
-gboolean    gtk_source_undo_manager_can_redo(const GtkSourceUndoManager *um);
-
-void      gtk_source_undo_manager_undo(GtkSourceUndoManager   *um);
-void      gtk_source_undo_manager_redo(GtkSourceUndoManager   *um);
-
-void      gtk_source_undo_manager_begin_not_undoable_action(GtkSourceUndoManager  *um);
-void      gtk_source_undo_manager_end_not_undoable_action(GtkSourceUndoManager  *um);
-
-gint      gtk_source_undo_manager_get_max_undo_levels(GtkSourceUndoManager   *um);
-void      gtk_source_undo_manager_set_max_undo_levels(GtkSourceUndoManager   *um,
-                        gint        undo_levels);
-
-G_END_DECLS
-
-#endif  // UNDOVIEW_UNDO_MANAGER_H_
-
diff --git a/third_party/undoview/undo_view.c b/third_party/undoview/undo_view.c
deleted file mode 100644
index 03ea16a..0000000
--- a/third_party/undoview/undo_view.c
+++ /dev/null
@@ -1,83 +0,0 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Boilerplate code was generated by http://burtonini.com/cgi/gobject.py
-
-#include <gdk/gdkkeysyms.h>
-
-#include "undo_view.h"
-
-G_DEFINE_TYPE (GtkUndoView, gtk_undo_view, GTK_TYPE_TEXT_VIEW)
-
-static void
-gtk_undo_view_dispose(GObject *object) {
-  GtkUndoView *uview = GTK_UNDO_VIEW(object);
-
-  if(uview->undo_manager_) {
-    g_object_unref(G_OBJECT(uview->undo_manager_));
-    uview->undo_manager_ = NULL;
-  }
-  G_OBJECT_CLASS(gtk_undo_view_parent_class)->dispose(object);
-}
-
-static void
-gtk_undo_view_undo(GtkUndoView *uview) {
-  if(gtk_source_undo_manager_can_undo(uview->undo_manager_))
-    gtk_source_undo_manager_undo(uview->undo_manager_);
-}
-
-static void
-gtk_undo_view_redo(GtkUndoView *uview) {
-  if(gtk_source_undo_manager_can_redo(uview->undo_manager_))
-    gtk_source_undo_manager_redo(uview->undo_manager_);
-}
-
-static void
-gtk_undo_view_class_init(GtkUndoViewClass *klass) {
-  GObjectClass *object_class = G_OBJECT_CLASS(klass);
-  GtkBindingSet *binding_set;
-
-  g_signal_new("undo",
-      G_TYPE_FROM_CLASS(klass),
-      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
-      G_STRUCT_OFFSET(GtkUndoViewClass, undo),
-      NULL,
-      NULL,
-      g_cclosure_marshal_VOID__VOID,
-      G_TYPE_NONE,
-      0);
-  g_signal_new("redo",
-      G_TYPE_FROM_CLASS(klass),
-      G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
-      G_STRUCT_OFFSET(GtkUndoViewClass, redo),
-      NULL,
-      NULL,
-      g_cclosure_marshal_VOID__VOID,
-      G_TYPE_NONE,
-      0);
-
-  klass->undo = gtk_undo_view_undo;
-  klass->redo = gtk_undo_view_redo;
-
-  binding_set = gtk_binding_set_by_class(klass);
-  gtk_binding_entry_add_signal(binding_set, GDK_z, GDK_CONTROL_MASK, "undo", 0);
-  gtk_binding_entry_add_signal(binding_set, GDK_y, GDK_CONTROL_MASK, "redo", 0);
-  gtk_binding_entry_add_signal(binding_set, GDK_z, GDK_CONTROL_MASK | GDK_SHIFT_MASK, "redo", 0);
-  gtk_binding_entry_add_signal(binding_set, GDK_F14, 0, "undo", 0);
-
-  object_class->dispose = gtk_undo_view_dispose;
-}
-
-static void
-gtk_undo_view_init(GtkUndoView *self) {
-}
-
-GtkWidget*
-gtk_undo_view_new(GtkTextBuffer *buffer) {
-  GtkWidget *ret = g_object_new(GTK_TYPE_UNDO_VIEW, "buffer", buffer, NULL);
-  GTK_UNDO_VIEW(ret)->undo_manager_ = gtk_source_undo_manager_new(GTK_TEXT_BUFFER(buffer));
-
-  return ret;
-}
-
diff --git a/third_party/undoview/undo_view.h b/third_party/undoview/undo_view.h
deleted file mode 100644
index 7fccf87..0000000
--- a/third_party/undoview/undo_view.h
+++ /dev/null
@@ -1,50 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-// Boilerplate code was generated by http://burtonini.com/cgi/gobject.py
-
-#ifndef UNDOVIEW_UNDO_VIEW_H_
-#define UNDOVIEW_UNDO_VIEW_H_
-
-#include <gtk/gtk.h>
-#include "undo_manager.h"
-
-G_BEGIN_DECLS
-
-#define GTK_TYPE_UNDO_VIEW gtk_undo_view_get_type()
-
-#define GTK_UNDO_VIEW(obj) \
-  (G_TYPE_CHECK_INSTANCE_CAST((obj), GTK_TYPE_UNDO_VIEW, GtkUndoView))
-
-#define GTK_UNDO_VIEW_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_CAST((klass), GTK_TYPE_UNDO_VIEW, GtkUndoViewClass))
-
-#define GTK_IS_UNDO_VIEW(obj) \
-  (G_TYPE_CHECK_INSTANCE_TYPE((obj), GTK_TYPE_UNDO_VIEW))
-
-#define GTK_IS_UNDO_VIEW_CLASS(klass) \
-  (G_TYPE_CHECK_CLASS_TYPE((klass), GTK_TYPE_UNDO_VIEW))
-
-#define GTK_UNDO_VIEW_GET_CLASS(obj) \
-  (G_TYPE_INSTANCE_GET_CLASS((obj), GTK_TYPE_UNDO_VIEW, GtkUndoViewClass))
-
-typedef struct {
-  GtkTextView parent;
-  GtkSourceUndoManager *undo_manager_;
-} GtkUndoView;
-
-typedef struct {
-  GtkTextViewClass parent_class;
-
-  void (*undo)(GtkUndoView *);
-  void (*redo)(GtkUndoView *);
-} GtkUndoViewClass;
-
-GType gtk_undo_view_get_type(void);
-
-GtkWidget* gtk_undo_view_new(GtkTextBuffer *buffer);
-
-G_END_DECLS
-
-#endif  // UNDOVIEW_UNDO_VIEW_H_
diff --git a/third_party/undoview/undoview.gyp b/third_party/undoview/undoview.gyp
deleted file mode 100644
index 424ffcb..0000000
--- a/third_party/undoview/undoview.gyp
+++ /dev/null
@@ -1,22 +0,0 @@
-# Copyright (c) 2010 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-{
-  'targets': [
-    {
-      'target_name': 'undoview',
-      'type': 'static_library',
-      'sources': [
-        'undo_manager.h',
-        'undo_manager.c',
-        'undo_view.h',
-        'undo_view.c',
-      ],
-
-      'dependencies' : [
-        '../../build/linux/system.gyp:gtk',
-      ],
-    },
-  ],
-}