Linux: really hides the tab close button when it should not be painted.

chrome/browser/gtk/tabs/tab_gtk.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/gtk/tabs/tab_gtk.h"
 
 #include "app/gfx/path.h"
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "chrome/browser/gtk/custom_button.h"
@@ skipping 213 matching lines @@
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabGtk, TabRendererGtk overrides:
 
 bool TabGtk::IsSelected() const {
   return delegate_->IsTabSelected(this);
 }
 
 void TabGtk::CloseButtonResized(const gfx::Rect& bounds) {
-  gtk_fixed_move(GTK_FIXED(TabRendererGtk::widget()),
-      close_button_.get()->widget(), bounds.x(), bounds.y());
+  if (!bounds.IsEmpty()) {
+    gtk_fixed_move(GTK_FIXED(TabRendererGtk::widget()),
+        close_button_.get()->widget(), bounds.x(), bounds.y());
+    gtk_widget_show(close_button_.get()->widget());
+  } else {
+    gtk_widget_hide(close_button_.get()->widget());
+  }
 }
 
 void TabGtk::Paint(GdkEventExpose* event) {
   TabRendererGtk::Paint(event);
 
   gtk_container_propagate_expose(GTK_CONTAINER(TabRendererGtk::widget()),
         close_button_.get()->widget(), event);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ skipping 17 matching lines @@
 }
 
 CustomDrawButton* TabGtk::MakeCloseButton() {
   CustomDrawButton* button = new CustomDrawButton(IDR_TAB_CLOSE,
       IDR_TAB_CLOSE_P, IDR_TAB_CLOSE_H, IDR_TAB_CLOSE);
 
   g_signal_connect(G_OBJECT(button->widget()), "clicked",
                    G_CALLBACK(OnCloseButtonClicked), this);
   GTK_WIDGET_UNSET_FLAGS(button->widget(), GTK_CAN_FOCUS);
   gtk_fixed_put(GTK_FIXED(TabRendererGtk::widget()), button->widget(), 0, 0);
-  gtk_widget_show(button->widget());
 
   return button;
 }