[Mac] Adjust Omnibox implementation to not break undo chain.

This does not fix undo, it just makes the implementation break it
less.

BUG=18084
TEST=Omnibox should continue to work.

Review URL: http://codereview.chromium.org/337027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30071 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 15 insertions, 0 deletions

diff --git a/chrome/browser/cocoa/autocomplete_text_field.mm b/chrome/browser/cocoa/autocomplete_text_field.mm
index 3071519..182a8b3 100644
--- a/chrome/browser/cocoa/autocomplete_text_field.mm
+++ b/chrome/browser/cocoa/autocomplete_text_field.mm
@@ -193,4 +193,19 @@
   return NO;
 }
 
+- (void)setAttributedStringValue:(NSAttributedString*)aString {
+  NSTextView* editor = static_cast<NSTextView*>([self currentEditor]);
+  if (!editor) {
+    [super setAttributedStringValue:aString];
+  } else {
+    // -currentEditor is defined to return NSText*, make sure our
+    // assumptions still hold, here.
+    DCHECK([editor isKindOfClass:[NSTextView class]]);
+
+    NSTextStorage* textStorage = [editor textStorage];
+    DCHECK(textStorage);
+    [textStorage setAttributedString:aString];
+  }
+}
+
 @end