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Stephen Boddy be55400ec6 Remove stale autosave file on clean Blender quit

Previously the autosaved copy was only ever overwritten, never removed,
so a deliberate quit (whether the user saved or chose "don't save")
still nagged with a recovery prompt on next startup.

Registers an atexit cleanup that removes the active IFC's autosave
file(s) on a graceful interpreter shutdown. atexit never runs on an
actual crash, so a genuine crash still leaves the recovery file in
place as before.

The cleanup reads a cached plain-string path kept up to date by
reset_timer(), rather than looking it up live via bpy.context - by
the time atexit fires, Blender's C++ side is torn down far enough
that even a read-only bpy.context.scene access aborts the process
(std::bad_optional_access) instead of raising a catchable exception.

Generated with the assistance of an AI coding tool.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

2026-07-11 10:50:00 +01:00