[Bug 77595] After mapping an action to delete key, original delete key operation is not restored once reverted

[Rog]

*** This bug is a duplicate of bug 40747 ***

Public bug reported:

After accidentally pressing the delete key on an action in the gnome-
keybinding-preferences dialog, I subsequently disabled that action so it
was no longer mapped to any key.  As a result of the initial mistake, my
delete key no longer had it's usual "delete character to the right"
behaviour.

To reproduce, choose an action in the gnome-keybinding-preferences and press delete, then set the action to some other key.  Now, checking 'xev', or 'xmodmap -pke' shows a blank keysym for keycode 107 (which should be "Delete").  After resetting this value using:
xmodmap -e 'keycode 107 = Delete'
the correct delete key behavior is restored.

This "bug" is probably more the result of the "Delete" keysym not being
represented in the preferences to allow it to be restored than that of
it being unassigned as the result of a reverted mapping.

** Affects: control-center (Ubuntu)
     Importance: Medium
     Assignee: Ubuntu Desktop Bugs
         Status: Rejected

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After mapping an action to delete key, original delete key operation is not restored once reverted
https://launchpad.net/bugs/77595