Make tabOverlap dynamic depending on the number of non-mini tabs presented on...

chrome/browser/cocoa/tab_controller.mm

 // 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.
 
 #include "app/l10n_util_mac.h"
 #include "base/mac_util.h"
 #import "chrome/browser/browser_theme_provider.h"
 #import "chrome/browser/cocoa/menu_controller.h"
 #import "chrome/browser/cocoa/tab_controller.h"
 #import "chrome/browser/cocoa/tab_controller_target.h"
@@ skipping 126 matching lines @@
   return [contextMenuController_ menu];
 }
 
 - (IBAction)closeTab:(id)sender {
   if ([[self target] respondsToSelector:@selector(closeTab:)]) {
     [[self target] performSelector:@selector(closeTab:)
                         withObject:[self view]];
   }
 }
 
+- (BOOL)hovered {
+  TabView* tabView = static_cast<TabView*>([self view]);
+  return [tabView isMouseIn];
+}
+
 - (void)setTitle:(NSString*)title {
   [[self view] setToolTip:title];
   if ([self mini] && ![self selected]) {
     TabView* tabView = static_cast<TabView*>([self view]);
     DCHECK([tabView isKindOfClass:[TabView class]]);
     [tabView startAlert];
   }
   [super setTitle:title];
 }
 
@@ skipping 58 matching lines @@
 
   int iconCapacity = [self iconCapacity];
   if ([self selected])
     return iconCapacity >= 2;
   return iconCapacity >= 1;
 }
 
 // Returns YES if we should be showing the close button. The selected tab
 // always shows the close button.
 - (BOOL)shouldShowCloseButton {
-  if ([self mini])
+  if ([self mini] || (![self selected] && [self hovered]))
     return NO;
   return ([self selected] || [self iconCapacity] >= 3);
 }
 
 - (void)updateVisibility {
   // iconView_ may have been replaced or it may be nil, so [iconView_ isHidden]
   // won't work.  Instead, the state of the icon is tracked separately in
   // isIconShowing_.
   BOOL oldShowIcon = isIconShowing_ ? YES : NO;
   BOOL newShowIcon = [self shouldShowIcon] ? YES : NO;
@@ skipping 69 matching lines @@
 // Called by the tabs to determine whether we are in rapid (tab) closure mode.
 - (BOOL)inRapidClosureMode {
   if ([[self target] respondsToSelector:@selector(inRapidClosureMode)]) {
     return [[self target] performSelector:@selector(inRapidClosureMode)] ?
         YES : NO;
   }
   return NO;
 }
 
 @end