Game Over GUI buttons disabled if switching fullscreen

[ElNounch]

Which modpack version are you using?

2.1.0.0

If in multiplayer; On which server does this happen?

Delta

What did you try to do, and what did you expect to happen?

Player die,
Game over screen take over controls and offer two buttons : "Respawn" and "Title screen", both disabled.
A second later, both buttons becomes available.
Press F11 to toggle full screen.
Buttons disabled again, never re-enabled, can't use key.
Re-toggling full screen keep the buttons disabled.

What happened instead? (Attach screenshots if needed)

Buttons should have stay enabled.

Switching back to minimized GTNH window, only to find out you got killed and need to reload whole GTNH definitely isn't fun...

What do you suggest instead/what changes do you propose?

PR to follow...

What is your GTNH Discord username?

ElNounch