Pass button_rect when opening window menu from button

When opening the window menu without an associated control - e.g.
by right-clicking the titlebar or by keyboard - using coordinates
for the menu position is appropriate. However when the menu is
associated with a window button, the expected behavior in the
shell can be implemented much easier with the full button geometry:
the menu will point to the center of the button's bottom edge
rather than align to the left/right side of the titlebar as it
does now, and the clickable area where a release event does not
dismiss the menu will match the actual clickable area in mutter.

So add an additional show_window_menu_for_rect() function and
use it when opening the menu from a button.

https://bugzilla.gnome.org/show_bug.cgi?id=731058

src/compositor/compositor.c

@@ -1366,3 +1366,12 @@ meta_compositor_show_window_menu (MetaCompositor     *compositor,
 {
   meta_plugin_manager_show_window_menu (compositor->plugin_mgr, window, menu, x, y);
 }
+
+void
+meta_compositor_show_window_menu_for_rect (MetaCompositor     *compositor,
+                                           MetaWindow         *window,
+                                           MetaWindowMenuType  menu,
+					   MetaRectangle      *rect)
+{
+  meta_plugin_manager_show_window_menu_for_rect (compositor->plugin_mgr, window, menu, rect);
+}

src/compositor/meta-plugin-manager.c

@@ -374,3 +374,20 @@ meta_plugin_manager_show_window_menu (MetaPluginManager  *plugin_mgr,
   if (klass->show_window_menu)
     klass->show_window_menu (plugin, window, menu, x, y);
 }
+
+void
+meta_plugin_manager_show_window_menu_for_rect (MetaPluginManager  *plugin_mgr,
+                                               MetaWindow         *window,
+                                               MetaWindowMenuType  menu,
+					       MetaRectangle      *rect)
+{
+  MetaPlugin *plugin = plugin_mgr->plugin;
+  MetaPluginClass *klass = META_PLUGIN_GET_CLASS (plugin);
+  MetaDisplay *display = plugin_mgr->compositor->display;
+
+  if (display->display_opening)
+    return;
+
+  if (klass->show_window_menu_for_rect)
+    klass->show_window_menu_for_rect (plugin, window, menu, rect);
+}

src/compositor/meta-plugin-manager.h

@@ -87,5 +87,10 @@ void meta_plugin_manager_show_window_menu (MetaPluginManager  *mgr,
                                            int                 x,
                                            int                 y);
 
+void meta_plugin_manager_show_window_menu_for_rect (MetaPluginManager  *mgr,
+		                                    MetaWindow         *window,
+						    MetaWindowMenuType  menu,
+						    MetaRectangle      *rect);
+
 
 #endif

src/core/core.c

@@ -392,6 +392,22 @@ meta_core_show_window_menu (Display            *xdisplay,
   meta_window_show_menu (window, menu, root_x, root_y);
 }
 
+void
+meta_core_show_window_menu_for_rect (Display            *xdisplay,
+                                     Window              frame_xwindow,
+                                     MetaWindowMenuType  menu,
+                                     MetaRectangle      *rect,
+                                     guint32             timestamp)
+{
+  MetaWindow *window = get_window (xdisplay, frame_xwindow);
+
+  if (meta_prefs_get_raise_on_click ())
+    meta_window_raise (window);
+  meta_window_focus (window, timestamp);
+
+  meta_window_show_menu_for_rect (window, menu, rect);
+}
+
 const char*
 meta_core_get_workspace_name_with_index (Display *xdisplay,
                                          Window   xroot,

src/core/core.h

@@ -26,6 +26,7 @@
 /* Don't include core headers here */
 #include <gdk/gdkx.h>
 #include <meta/common.h>
+#include <meta/boxes.h>
 
 typedef enum
 {
@@ -138,6 +139,12 @@ void meta_core_show_window_menu (Display            *xdisplay,
                                  int                 root_y,
                                  guint32             timestamp);
 
+void meta_core_show_window_menu_for_rect (Display            *xdisplay,
+                                          Window              frame_xwindow,
+                                          MetaWindowMenuType  menu,
+                                          MetaRectangle      *rect,
+                                          guint32             timestamp);
+
 gboolean   meta_core_begin_grab_op (Display    *xdisplay,
                                     Window      frame_xwindow,
                                     MetaGrabOp  op,

src/core/window-private.h

@@ -575,6 +575,10 @@ void meta_window_show_menu (MetaWindow         *window,
                             int                 x,
                             int                 y);
 
+void meta_window_show_menu_for_rect (MetaWindow         *window,
+                                     MetaWindowMenuType  menu,
+                                     MetaRectangle      *rect);
+
 gboolean meta_window_handle_mouse_grab_op_event  (MetaWindow         *window,
                                                   const ClutterEvent *event);
 

src/core/window.c

@@ -5251,6 +5251,15 @@ meta_window_show_menu (MetaWindow         *window,
   meta_compositor_show_window_menu (window->display->compositor, window, menu, x, y);
 }
 
+void
+meta_window_show_menu_for_rect (MetaWindow         *window,
+                                MetaWindowMenuType  menu,
+                                MetaRectangle      *rect)
+{
+  g_return_if_fail (!window->override_redirect);
+  meta_compositor_show_window_menu_for_rect (window->display->compositor, window, menu, rect);
+}
+
 void
 meta_window_shove_titlebar_onscreen (MetaWindow *window)
 {

src/meta/compositor.h

@@ -127,5 +127,9 @@ void meta_compositor_show_window_menu (MetaCompositor     *compositor,
 				       MetaWindowMenuType  menu,
                                        int                 x,
                                        int                 y);
+void meta_compositor_show_window_menu_for_rect (MetaCompositor     *compositor,
+                                                MetaWindow         *window,
+				                MetaWindowMenuType  menu,
+                                                MetaRectangle      *rect);
 
 #endif /* META_COMPOSITOR_H */

src/meta/meta-plugin.h

@@ -170,6 +170,11 @@ struct _MetaPluginClass
                              int                 x,
                              int                 y);
 
+  void (*show_window_menu_for_rect)  (MetaPlugin         *plugin,
+		                      MetaWindow         *window,
+				      MetaWindowMenuType  menu,
+				      MetaRectangle      *rect);
+
   /**
    * MetaPluginClass::kill_window_effects:
    * @actor: a #MetaWindowActor

src/ui/frames.c

@@ -1218,30 +1218,31 @@ meta_frames_button_press_event (GtkWidget      *widget,
         {
           MetaFrameGeometry fgeom;
           GdkRectangle *rect;
+          MetaRectangle root_rect;
           MetaWindowMenuType menu;
-          int dx, dy;
+          int win_x, win_y;
 
           meta_frames_calc_geometry (frames, frame, &fgeom);
 
           rect = control_rect (control, &fgeom);
 
-          /* get delta to convert to root coords */
+          /* convert to root coords */
-          dx = event->x_root - event->x;
+          win_x = event->x_root - event->x;
-          dy = event->y_root - event->y;
+          win_y = event->y_root - event->y;
 
-          /* Align to the right end of the menu rectangle if RTL */
+          root_rect.x = win_x + rect->x;
-          if (meta_ui_get_direction() == META_UI_DIRECTION_RTL)
+          root_rect.y = win_y + rect->y;
-            dx += rect->width;
+          root_rect.width = rect->width;
+          root_rect.height = rect->height;
 
           menu = control == META_FRAME_CONTROL_MENU ? META_WINDOW_MENU_WM
                                                     : META_WINDOW_MENU_APP;
 
-          meta_core_show_window_menu (display,
+          meta_core_show_window_menu_for_rect (display,
-                                      frame->xwindow,
+                                               frame->xwindow,
-                                      menu,
+                                               menu,
-                                      rect->x + dx,
+                                               &root_rect,
-                                      rect->y + rect->height + dy,
+                                               event->time);
-                                      event->time);
         }
     }
   else if (event->button == 1 &&