window: Always pass focused widget to widget motion handlers

Grabbed widgets should always receive motion events as if it was the
widget that would receive it if no grab was active. This means that the
focused widget should always be passed as the widget argument to widget
motion handlers.

This reverts commit 8c9c8fcf6e.

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>

clients/window.c

@@ -2095,7 +2095,7 @@ pointer_handle_motion(void *data, struct wl_pointer *pointer,
 	else
 		widget = input->focus_widget;
 	if (widget && widget->motion_handler)
-		cursor = widget->motion_handler(widget,
+		cursor = widget->motion_handler(input->focus_widget,
 						input, time, sx, sy,
 						widget->user_data);