[Bug 85334] Keyboard Shortcuts can consume a-z keys

[Kaso]

Public bug reported:

Normally when trying to enter a standard alpha-numeric key in the
Keyboard Shortcut program you are warned that using this as a shortcut
will cause it to become un-usable for typing, however this following by-
passes this warning and allows you to bind an a-z key to a shortcut,
'consuming' this key.

1) Find an Action within the "Sound" section ("Desktop" section does not suffer this problem)
2) Bind a Action to Control - z   (any alphanumeric key works here, z for this example)
3) Bind this same action to z (the "Shortcut field will now display "XF86AudioPlay")
4) z Key is now consumed and is unable to be used for typing even if this action is un-bound.

** Affects: control-center (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

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Keyboard Shortcuts can consume a-z keys
https://launchpad.net/bugs/85334