Asks the windowing system to show the window menu.
The window menu is the menu shown when right-clicking the titlebar on traditional windows managed by the window manager. This is useful for windows using client-side decorations, activating it with a right-click on the window decorations.
| this |
a `GdkToplevel` |
| event |
a `GdkEvent` to show the menu for |
|
true if the window menu was shown and false otherwise. |