This patch removes modifiers when processing key events for the
particular modifier key. For example, previously a Shift keypress
would register as a Shift + Shift modifier event.
This would cause issues when a modifier key as the action key in
the input map, because unpresses of the modifier key don't match as
matching inputs for that action. E.g. if Shift is used as an action,
the stored action event is Shift + Shift modifier (as indicated
in the editor as "Shift + Shift". The unpress event does not have the
Shift modifier set, so the event of unpressing Shift + no modifier
doesn't match the action which has the modifier set.
This patch removes the shift modifier on just pressing the Shift
key down, so the action event is registered as just Shift with
no modifier (as indicated in the editor as "Shift"), which matches
the unpress event.
fa62125e05
