[Bug 34595] some shortcuts does not work with some commands

[Peter Chabada]

Public bug reported:
https://launchpad.net/malone/bugs/34595

Affects: control-center gnome-control-center (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
Keyboard shortcut dialog, gnome-control-center 2.13.93-0ubuntu2.

Some commands does not run with some shortcuts while other commands with
same shortcuts run properly.

To reproduce try to set Win+C (or any other combination with Win key) to
calculator. I see in list "<Mod4>c" but when I try to use it nothing
happens. When I set shortcut to "<Control><Alt>c" calculator will start.
I also tried to set "<Mod4>c" combination for terminal and it works
(terminal started).

It seems that some combinations action-shortcut cannot use Win key. Other not working assigments:
<Mod4>f - find
<Mod4>w - web browser
<Mod4>e - e-mail
<Mod4>h - home
<Mod4>l - lock screen
<Mod4>j - eject

I have assigned Super to Win key.