Fullscreen Bug

Put the summary of the bug you're having here

So i was playing Minecraft on full screen, and i wanted to open another window using the Super(Windows button)+Tab.

It did switch to another window, but the problem was that i couldn' t click anything. No buttons, no opening new windows, no nothing. So i had to use the same combination to switch back to minecraft, exit full screen and then i could do stuff.

Steps to Reproduce:
1. Open Minecraft in Ubuntu in full screen.
2. Use the Super+Tab combination to switch to another window.
3. Bug triggered!