On pointer grab request native events needed for event emulation

When we grab the pointer we need to request more events than what is
specified, otherwise our event emulation stop working and you won't
e.g. get crossing event unless you specified motion event mask.

1 files changed, 18 insertions, 1 deletions

diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index 3231deac6d..c8e7249ec5 100644
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -1184,6 +1184,23 @@ get_native_event_mask (GdkWindowObject *private)
     }
 }
 
+static GdkEventMask
+get_native_grab_event_mask (GdkEventMask grab_mask)
+{
+  /* Similar to the above but for pointer events only */
+  return
+    GDK_POINTER_MOTION_MASK |
+    GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
+    GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK |
+    GDK_SCROLL_MASK |
+    (grab_mask &
+     ~(GDK_POINTER_MOTION_HINT_MASK |
+       GDK_BUTTON_MOTION_MASK |
+       GDK_BUTTON1_MOTION_MASK |
+       GDK_BUTTON2_MOTION_MASK |
+       GDK_BUTTON3_MOTION_MASK));
+}
+
 /* Puts the native window in the right order wrt the other native windows
  * in the hierarchy, given the position it has in the client side data.
  * This is useful if some operation changed the stacking order.
@@ -9564,7 +9581,7 @@ gdk_pointer_grab (GdkWindow *	  window,
   res = _gdk_windowing_pointer_grab (window,
 				     native,
 				     owner_events,
-				     event_mask,
+				     get_native_grab_event_mask (event_mask),
 				     confine_to,
 				     cursor,
 				     time);