Calling this function signals to the toolbar that the
overflow menu item for @tool_item has changed. If the
overflow menu is visible when this function it called,
the menu will be rebuilt.
The function must be called when the tool item changes what it
will do in response to the #GtkToolItem::create-menu-proxy signal.
Calling this function signals to the toolbar that the overflow menu item for @tool_item has changed. If the overflow menu is visible when this function it called, the menu will be rebuilt.
The function must be called when the tool item changes what it will do in response to the #GtkToolItem::create-menu-proxy signal.