GTK: Fix some event coordinate logic

chrome/browser/gtk/browser_window_gtk.cc

 // 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 "chrome/browser/gtk/browser_window_gtk.h"
 
 #include <gdk/gdkkeysyms.h>
 
 #include <string>
 
@@ skipping 1894 matching lines @@
         // we don't call gtk_window_begin_move_drag.
         static GtkSettings* settings = gtk_settings_get_default();
         gint double_click_time = 250;
         gint double_click_distance = 5;
         g_object_get(G_OBJECT(settings),
                      "gtk-double-click-time", &double_click_time,
                      "gtk-double-click-distance", &double_click_distance,
                      NULL);
 
         guint32 click_time = event->time - last_click_time;
-        int click_move_x = static_cast<int>(event->x - last_click_position.x());
-        int click_move_y = static_cast<int>(event->y - last_click_position.y());
+        int click_move_x = abs(event->x - last_click_position.x());
+        int click_move_y = abs(event->y - last_click_position.y());
 
         if (click_time > static_cast<guint32>(double_click_time) ||
             click_move_x > double_click_distance ||
             click_move_y > double_click_distance) {
           // Ignore drag requests if the window is the size of the screen.
           // We do this to avoid triggering fullscreen mode in metacity
           // (without the --no-force-fullscreen flag) and in compiz (with
           // Legacy Fullscreen Mode enabled).
           GdkScreen* screen = gtk_window_get_screen(window_);
           if (bounds_.width() != gdk_screen_get_width(screen) ||
@@ skipping 214 matching lines @@
   // special-case the ones where the custom frame should be used.  These names
   // are taken from the WMs' source code.
   return (wm_name == "Blackbox" ||
           wm_name == "compiz" ||
           wm_name == "e16" ||  // Enlightenment DR16
           wm_name == "Metacity" ||
           wm_name == "Mutter" ||
           wm_name == "Openbox" ||
           wm_name == "Xfwm4");
 }