Fix editor hanging when using a tiling WM.

Created by: oisincar

Fixes bug with i3 and xmonad where the editor would get stuck in a loop since it can never become full screen.

Now, wait only up to 1 second for the editor to become full screen, terminating and printing a warning message otherwise.

Fixes #15068 (closed), while not breaking #14336 (closed) (Splash screen bug).