Comment 5 for bug 251679

Can you pop up the menu by context key in gnome-terminal?

I wonder if vte is calling on_vte_popup_menu after the keypress in your side. This could be easily found out by inserting a print. And I can confirm on_vte_keypress() is called with keyname = "Menu" for the keypress.

My lib versions, if this could matter:

$ dpkg -l|grep vte
ii libvte-common 1:0.16.13-1ubuntu1 Terminal emulator widget for GTK+ 2.0 - comm
ii libvte9 1:0.16.13-1ubuntu1 Terminal emulator widget for GTK+ 2.0 - runt
ii python-vte 1:0.16.13-1ubuntu1 Python bindings for the VTE widget set