ffplay fails to restore window position correctly upon toggling 'maximize'

[grepfor]

Summary of the bug: Toggling the ffplay 'maximize' function (e.g., by typing 'f' twice) does not restore the window to its original position; the restored position is offset by (dx, dy), where dx and dy are the width and height of the window decorations.

Add'l info:

• System: Arch linux, kernel 6.1.68

• Window manager: fvwm3.

• Issue does not occur if the window has no decorations, presumably because in this case dx = dy = 0.

• mpv does not exhibit this behavior, leading me to believe that the problem is more likely ffplay/ffmpeg rather than my window manager.

How to reproduce:

$ ffplay -left 0 -top 0 some_video.mp4   # Place window northwest corner at (0,0)

Now type 'f' twice to maximize/restore the window position. What I observe is that the restored window position is now at (dx,dy), rather than at (0,0) where it began. Hit "f" two more times, and the restored position is now at (2*dx, 2*dy), etc.

[grepfor]

LATER NOTE: Same behavior observed with git-master:

ffplay version N-115827-gcdd139d760