Minecraft flashes white when going back to the main menu screen.

What I expected to happen was...:
When going back to the main menu, it just went back the normal way.

What actually happened was...:
Instead, it had a fast white flash before the main menu opens.

Steps to reproduce:
1. Go to either Singleplayer, Multiplayer, Language or Options.
2. Press Cancel if your in Multiplayer or in Singleplayer.
3. Press Done if your in Options or in Language.
4. Right before the Main Menu shows up, a fast white flash should appear.