From duplicate bug:
1. Open gnome-screenshot in interactive mode.
2. Set a delay, then click on "Take Screenshot".
3. Focus on an application, then open one of its menus in appmenu-gtk.
4. Wait for the screenshot delay.
5. A window from gnome-screenshot will open, causing appmenu-gtk to switch to generic menu entries (File and Edit).
6. Notice that there is a white box replacing the menu previously open, and that the desktop is frozen.
From duplicate bug:
1. Open gnome-screenshot in interactive mode.
2. Set a delay, then click on "Take Screenshot".
3. Focus on an application, then open one of its menus in appmenu-gtk.
4. Wait for the screenshot delay.
5. A window from gnome-screenshot will open, causing appmenu-gtk to switch to generic menu entries (File and Edit).
6. Notice that there is a white box replacing the menu previously open, and that the desktop is frozen.