window: Pass the grab timestamp when updating the resize grab

Since XChangeActivePointerGrab doesn't have a direct equivalent
in XI2, we need to make sure we don't re-grab with a newer
tiemstamp.

src/core/display-private.h

@@ -211,6 +211,7 @@ struct _MetaDisplay
   GList*      grab_old_window_stacking;
   MetaEdgeResistanceData *grab_edge_resistance_data;
   unsigned int grab_last_user_action_was_snap;
+  guint32     grab_timestamp;
 
   /* we use property updates as sentinels for certain window focus events
    * to avoid some race conditions on EnterNotify events

src/core/display.c

@@ -3873,6 +3873,7 @@ meta_display_begin_grab_op (MetaDisplay *display,
 #endif
   display->grab_frame_action = frame_action;
   display->grab_resize_unmaximize = 0;
+  display->grab_timestamp = timestamp;
 
   if (display->grab_resize_timeout_id)
     {
@@ -4058,6 +4059,7 @@ meta_display_end_grab_op (MetaDisplay *display,
     }
 #endif /* HAVE_XSYNC */
   
+  display->grab_timestamp = 0;
   display->grab_window = NULL;
   display->grab_screen = NULL;
   display->grab_xwindow = None;

src/core/window.c

@@ -9866,15 +9866,12 @@ meta_window_update_keyboard_resize (MetaWindow *window,
 
   if (update_cursor)
     {
-      guint32 timestamp;
-      /* FIXME: Using CurrentTime is really bad mojo */
-      timestamp = CurrentTime;
       meta_display_set_grab_op_cursor (window->display,
                                        NULL,
                                        window->display->grab_op,
                                        TRUE,
                                        window->display->grab_xwindow,
-                                       timestamp);
+                                       window->display->grab_timestamp);
     }
 }