Distinguish between top-row and KP number keys when displaying accelerators
Submitted by Owen Taylor
Currently, GtkAccelLabel shows '1' for both GDK_1 and GDK_KP_1 for accelerator displays, but treats them differently.
It should show 'KP 1' or '1 (Keypad)' or something like that.
This also applies to the symbols on the keypad such as /*-+.