Animation Playback window size not in sync with canvas size

Environment/Versions

• GIMP version: 2.99.18
• Package: Flatpak
• Operating System: Ubuntu 22.04

Description of the bug

The animation playback window is too wide when compared to the canvas

Reproduction

Is the bug reproducible?

Reproduction steps:

…

Expected result:

Expecting a window the same as canvas size

Actual result:

The playback windows is very big

Additional information

If you have a backtrace for a crash or a warning, paste it here.