The launcher icons can be shown during the Super Tab Launcher switcher.
For both the shortcut hints and the icons shortcut overlays we use the same policy: - If they were shown before starting the Super+Tab session, we still show them - If they were not shown before starting the Super+Tab session, they won't be ever shown
Plus, if we're pressing a valid unity shortcut key when the Launcher Switcher is active, we should terminate the switcher without doing anything.
UNBLOCK. Fixes: https://bugs.launchpad.net/bugs/943372, https://bugs.launchpad.net/bugs/943377. Approved by Thomi Richards.