Right-clicking the top of your window freezes your player

The Bug:

Right-clicking the top of your window freezes your player.

This is a problem because players in this state cannot move and do not take knockback until you click on the window again.

Steps to Reproduce:

1. Ensure that your game isn't in fullscreen and is in windowed mode.
2. Begin falling from a large height and right-click the top of your window.
3. Wait around ten seconds and then click the window again and return to your game.

Observed Behavior:

Your player freezes.

Expected Behavior:

Your player would not freeze.