gtk: Use the requested window bounds when determining the location of the sou...

chrome/browser/gtk/tabs/dragged_tab_controller_gtk.cc

 // Copyright (c) 2009 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/dragged_tab_controller_gtk.h"
 
 #include <algorithm>
 
 #include "chrome/browser/browser.h"
 #include "chrome/browser/gtk/browser_window_gtk.h"
@@ skipping 810 matching lines @@
   gdk_display_get_pointer(display, NULL, &x, &y, NULL);
 
   return gfx::Point(x, y);
 }
 
 // static
 gfx::Rect DraggedTabControllerGtk::GetTabScreenBounds(TabGtk* tab) {
   // A hidden widget moved with gtk_fixed_move in a GtkFixed container doesn't
   // update its allocation until after the widget is shown, so we have to use
   // the tab bounds we keep track of.
-  int x, y;
-  x = tab->bounds().x();
-  y = tab->bounds().y();
-
+  //
+  // We use the requested bounds instead of the allocation because the
+  // allocation is relative to the first windowed widget ancestor of the tab.
+  // Because of this, we can't use the tabs allocation to get the screen bounds.
+  gfx::Rect bounds = tab->GetRequisition();
   GtkWidget* widget = tab->widget();
   GtkWidget* parent = gtk_widget_get_parent(widget);
   gfx::Point point = gtk_util::GetWidgetScreenPosition(parent);
-  x += point.x();
-  y += point.y();
+  bounds.Offset(point);
 
-  return gfx::Rect(x, y, widget->allocation.width, widget->allocation.height);
+  return gfx::Rect(bounds.x(), bounds.y(), bounds.width(), bounds.height());
 }
 
 void DraggedTabControllerGtk::HideFrame() {
   GtkWidget* tabstrip = source_tabstrip_->widget();
   GtkWindow* window = platform_util::GetTopLevel(tabstrip);
   gtk_widget_hide(GTK_WIDGET(window));
 }
 
 void DraggedTabControllerGtk::CleanUpHiddenFrame() {
   // If the model we started dragging from is now empty, we must ask the
@@ skipping 38 matching lines @@
     gfx::NativeView dragged_tab = dragged_tab_->widget();
     dock_windows_.insert(dragged_tab);
     window = DockInfo::GetLocalProcessWindowAtPoint(GetCursorScreenPoint(),
                                                     dock_windows_);
     dock_windows_.erase(dragged_tab);
   }
 
   if (window)
     gtk_window_present(GTK_WINDOW(window));
 }