OC-41 - "Add new issue" key shortcut produces 3 dialogs on Mac Java 1.7

    This is fixed in Java 1.8, but I can't find a way to do deal with it
    other than to simply discard the extra events.

    This also changes the hotkey to be handled through the normal
    menu accelerator mechanism, so the hotkey shows up in the segment
    menu (it was previously hidden).