Window will not resize properly while loading a world.

When loading a single player world with the window smaller than max size, then maximizing the size of the window, the window gets bigger but the game just moves to the bottom left corner staying the same size.

The game should resize with the window and not stay the same.

Steps to Reproduce:
1. Make the window size smaller than maximum.
2. Select a world and hit play selected world.
3. Before the world is done loading, press the green plus button in the top left corner.