Toggle full screen ofcourse. So many apps + YT and stuff have that. So by habit I press Esc and than my game is gone :p
Toggle Fullscreen.
Pushing ESC pauses the game. It really pauses the game, does not toggle. Which doesn't really make sense....
Quit the game, but not the emulator.
On all revs I used in the past, it removes fullscreen, and on second esc, it closes window (usually crash).