I used to have the key combination Ctrl+Alt+Shift+' to start my scanner from the desktop (after having used the same in GIMP for years), but for some reason it is gone and I cannot recreate it. Keyboard is UK layout, and it's the ' (@) key I'm trying to use.
Clicking on the shortcut key window followed by Shift + Ctrl + Alt enters
CTRL + SHIFT + ALT +
in the box, and from here any letter
Z or number
9 key works. as do many others like
However, as soon as I press Ctrl+Alt+Shift+', the dialog loses focus and the field reverts to
How can I get my old keyboard shortcut back?