Put the summary of the bug you're having here

What I expected to happen was...:
I expected to still be able to use the Maximize button next to minimize and close buttons after full-screening then un-full-screening Minecraft.

What actually happened was...:
I was not able to use the Maximize button next to minimize and close buttons after full-screening then un-full-screening Minecraft.

Steps to Reproduce:
1. Press the F11 key to full-screen Minecraft.
2. Press the F11 key to un-full-screen Minecraft.
3. Notice that the "Maximize" button at the top right is now grayed out and the user is no longer able to Maximize the window.