Resizing the Minecraft window while dead grays out the Respawn and Title Screen buttons momentarily

The bug

When resizing the Minecraft window while dead (on the death screen), the Respawn and Title Screen buttons are temporarily grayed out.

Clones/relates to MC-2835.

A video is attached.

How to reproduce

1. Die (/kill)
2. Resize the window
   The Respawn and Title Screen buttons are temporarily disabled