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Menu edit - function unavailable in gtk
Regarding Nemo: This application does not seem to export Global Menus. Hence we are showing a minmal "fallback" menu with Copy, Paste,... just emulating a Ctrl-C, Ctrl-V keypress. Can you verify that Nemo shows proper menus on other systems?
What happens if you press Command-C, Command-V on the keyboard?
Regarding Xournal: Apparently the application is greying out the commands in the Global Menu, I don't know why the application is doing that. Bug in Xournal?
Nemo shows proper menus on other systems?
ubuntu unity (not my photo)

Bug in Xournal?
No, it works fine.
Command-C、Command-V
Work.
So, pressing Command-C、Command-V works but selecting the corresponding items from the "fake menu" doesn't?
Need to reproduce this.