Remapping PrintScreen key to Menu makes it impossible to use the renamed key to take screenshots

[TomasHnyk]

I do not have a menu key on my keyboard, instead I have prinsceen where Menu key normally is. So I remmaped it via xmodmap with the line:
keycode 107 = Menu NoSymbol Menu
I run xmodmap on a file with this line on every login. In xev, PrtScr correctly reports as Menu. When I try to reassign the Prinscreen command in settings>keyboard>shortcuts, to <ctrl>Menu, it seems to work and it works right away, but after I log out and log in, it no longer works even though the "<ctrl>Menu "still shows in settings>keyboard>shortcuts.

This is on 14.04, gnome-control-centre works flawlessly in this regard (I tried it under gnome-shell).

Short steps to reproduce:
1. Find out which keykode printcreen on your keyboard is using xev (I assume here it is 107)
2. xmodmap -e "keycode 107 = Menu NoSymbol Menu"
3.gsettings set org.gnome.settings-daemon.plugins.media-keys screenshot "<Super>Menu"
4. Verify it works by pressing Super+Menu=PrtScr
5. Log out an in.
6. It no longer works.

[TomasHnyk (sup)]

(An obvious workaround is running a script on login that sets the desired shortcuts.