From discussion with Cody: Fixing this is dependent on fixing GTK menus generally to bubble up to their parent any input that they don't handle specially themselves. It's the same basic problem as bug 324836 and bug 366193.
From discussion with Cody: Fixing this is dependent on fixing GTK menus generally to bubble up to their parent any input that they don't handle specially themselves. It's the same basic problem as bug 324836 and bug 366193.