Crashes when resizing the window on macOS

Resizing the OpenMW window causes OpenMW to hang/become unresponsive.

Reproduce by (1) launching in windowed mode, and (2) resizing the window.

resize_crash

Other details:

• This is OpenMW-specific.
• macOS 15.4.1, running on an Apple M3.
• This issue occurs on the master branch 87d77a68, the recent 0.49 release candidates, and on OpenMW 0.48 when built against a modern SDL2.
• Steam version of Morrowind with all expansions installed.
• No mods.
• I cleared my settings.cfg and other config. files to get back to default settings. This happens on a default settings.cfg.

This issue was also mentioned, along with many others, in #8266.