Detect mouse moving out of inventory slot (#16101)

Author: j-r

src/gui/guiInventoryList.cpp

@@ -203,10 +203,10 @@ bool GUIInventoryList::OnEvent(const SEvent &event)
 	if (!hovered || hovered->getID() == -1)
 		hovered = m_fs_menu;
 
-	bool ret = hovered->OnEvent(event);
-
 	IsVisible = was_visible;
 
+	bool ret = hovered->OnEvent(event);
+
 	return ret;
 }