Cursor doesn't focus on "Save and Quit to Title" when pressed escape until moved

The bug

The title describes itself.

If you press escape while in fullscreen in 17w47b, the mouse, despite being in the middle of the button, is not focused on(highlited). The resolution I use is 1600x900.

How to reproduce

1. Go into / create a world

2. Move the mouse a bit up or down

3. Press Escape or any key used to go to the menu

Possible bug cause

The bug is possibly caused because the mouse position is not updated until the cursor is moved.