Fixed the logical interaction between lp:~3v1n0/unity/super-tab-switcher and lp:~andyrock/unity/shortcut-hint as defined by design.
Plus, some code improvements and fixed an issue that caused the shortcut hint to show when pressing Super and clicking over the BFB to show the dash.
I'm wondering if we should avoid the same also when pressing over the workspace switcher.. Fixes: https://bugs.launchpad.net/bugs/918453. Appoved by Andrea Azzarone, Tim Penhey.