F6 (twitch streaming) causes bugs

1. Bug:

• Open creative inventory and click on blocks
• Then press F6 and click on "Cancel"
  You will notice that it closed but also that you "clicked" on food in your creative inventory

2. Bug:

• Press F6 while nothing other menu is open
• Press on "Cancel"
  You will notice that pressing the button isn't working the first time, but when clicking the second time on "Cancel" it works