Returns the keyvals bound to
The Nth `GdkKeymapKey` in
keys is bound to the Nth keyval in
When a keycode is pressed by the user, the keyval from this list of entries is selected by considering the effective keyboard group and level.
Free the returned arrays with g_free.
return location for array of `GdkKeymapKey`
return location for array of keyvals
true if there were any entries