Resizing the game window resets the checkbox value in the multiplayer warning screen

How to reproduce it:

1. If you already checked in "Do not show this screen again" you need to go to /.minecraft/options.txt and change skipMultiplayerWarning to false

2. Go to the main Minecraft screen

3. Click on multiplayer, the following image should appear
   

   [media]

4. Click the checkbox (to make it true)

5. Resize minecraft window (f11 for example)

6. The checkbox has been reset to false