[Mac] Fix a problem with flicker when moving the mouse off the reload button.

BUG=46981
TEST=Click on the reload button and leave the mouse inside.  When the page is finished reloading, move the mouse out of the button.  The button should re-enable and change from stop to reload, but the border should not flicker.
Review URL: http://codereview.chromium.org/3467003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@60085 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 9 insertions, 0 deletions

diff --git a/chrome/browser/cocoa/reload_button.mm b/chrome/browser/cocoa/reload_button.mm
index 404b035..4a46a51 100644
--- a/chrome/browser/cocoa/reload_button.mm
+++ b/chrome/browser/cocoa/reload_button.mm
@@ -6,6 +6,7 @@
 
 #include "base/nsimage_cache_mac.h"
 #include "chrome/app/chrome_dll_resource.h"
+#import "chrome/browser/cocoa/gradient_button_cell.h"
 #import "chrome/browser/cocoa/view_id_util.h"
 
 namespace {
@@ -66,6 +67,14 @@ NSString* const kStopImageName = @"stop_Template.pdf";
   } else if (force || ![self isMouseInside]) {
     [self setImage:nsimage_cache::ImageNamed(kReloadImageName)];
     [self setTag:IDC_RELOAD];
+
+    // This button's cell may not have received a mouseExited event, and
+    // therefore it could still think that the mouse is inside the button.  Make
+    // sure the cell's sense of mouse-inside matches the local sense, to prevent
+    // drawing artifacts.
+    id cell = [self cell];
+    if ([cell respondsToSelector:@selector(setMouseInside:animate:)])
+      [cell setMouseInside:[self isMouseInside] animate:NO];
     [self setEnabled:YES];
   } else if ([self tag] == IDC_STOP) {
     pendingReloadMode_ = YES;