Put the summary of the bug you're having here
What I expected to happen was...:
The game window should have gone fullscreen
What actually happened was...:
The window went fullscreen but the actual game remained a quarter of that size.
Steps to Reproduce:
1. Click on single player and choose a world
2. Click play selected world
3. while it is loading the world, maximize the game window before it finishes.
Linked issues
Attachments
Comments

Duplicate of MC-13661