Also, with Autosave turned on (set to 15-seconds on inactivity), when autosave triggers, the screen resets to non-full-screen-mod. If I haven't made any changes or have autosave turned off, the screen stays in full-screen. If I have autosave turned on but and actively making changes (no inactivity), it remains in full screen until the forced autosave (I used 2-minutes) triggers, then it goes back to non-full-screen (in the middle of a keystroke, even).
Very annoying and rather defeats the purpose of full-screen.