Leave titlebars early

When a client is unmanaged, we know emit mouse::leave on its titlebar before the
client object is invalidated, so that Lua can still work with it. Before, this
event was emitted only when we got a LeaveNotify from the X11 server.

Fixes: #620
Signed-off-by: Uli Schlachter <psychon@znc.in>

event.c

@@ -426,7 +426,7 @@ event_handle_destroynotify(xcb_destroy_notify_event_t *ev)
 
 /** Record that the given drawable contains the pointer.
  */
-static void
+void
 event_drawable_under_mouse(lua_State *L, int ud)
 {
     void *d;

event.h

@@ -48,7 +48,8 @@ awesome_refresh(void)
     return xcb_flush(globalconf.connection);
 }
 
-void event_handle(xcb_generic_event_t *event);
+void event_handle(xcb_generic_event_t *);
+void event_drawable_under_mouse(lua_State *, int);
 
 #endif
 // vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80

objects/client.c

@@ -1335,6 +1335,13 @@ client_unmanage(client_t *c, bool window_valid)
         if (c->titlebar[bar].drawable == NULL)
             continue;
 
+        if (globalconf.drawable_under_mouse == c->titlebar[bar].drawable) {
+            /* Leave drawable before we invalidate the client */
+            lua_pushnil(L);
+            event_drawable_under_mouse(L, -1);
+            lua_pop(L, 1);
+        }
+
         /* Forget about the drawable */
         luaA_object_push(L, c);
         luaA_object_unref_item(L, -1, c->titlebar[bar].drawable);