Unable to select 'respawn' after death and resizing of client window

i was playing half screen while fighting a zombie, fell in a hole and was slain by him, the respawn button was clickible at this stage.

I then maximised the window to full screen then the respawn button was not clickible at all.. i was not able to force crash minecraft either..

Steps to reproduce:
1. Have your window half screen
2. die
3. maximise window before clicking respawn
4. unable to click respawn