[Bug]: MacOS window fullscreen (pressing green plus button on SuperTux window) not properly restored after restart

[tobbi]

SuperTux Version

supertux2 dev v0.6.3 - a46a713 (master)

System Information

MacOS X 12.7.6

Expected Behavior

MacOS fullscreen mode should get restored on startup

Actual Behavior

Starting SuperTux in windowed mode, then pressing the green plus icon on the window to set it to fullscreen mode works but when quitting and restoring the game, it starts in windowed mode but the screen has fullscreen dimensions causing some of the window's contents to be invisible.

Steps To Reproduce Actual Behavior

1. Start SuperTux in windowed mode on macOS.
2. Click the green plus icon in the title bar to switch to fullscreen mode.
3. Quit SuperTux
4. Restart SuperTux

Additional Information

2025-12-20.14-43-00.mp4

Guidelines For Reporting Issues

• I have read https://github.com/SuperTux/supertux/blob/master/CONTRIBUTING.md#bug-reports.
• I have verified this isn't an issue that's already been reported.
• I have verified this isn't a discussion, or an issue about a crash or a feature request, but rather an actual bug ─ that is, the game did something not intended.
• I have verified this issue is not about wrong translations (use Transifex for those), or anything unsupported (e.g. third-party add-ons).
• In this report, I have only included details about one (1) bug.
• If I make a mistake while submitting this report, I agree to use the "Edit" feature to correct it, instead of closing this issue and opening a new one.