System information

• SolveSpace version: 3.1~0fd3af58 (latest, plus some fixes in my fork)

• Operating system: Windows 10 Pro 19045

Expected behavior

File saves as normal

Actual behavior

When attempting to save files with (some) images, SolveSpace freezes and cpu usage spikes. If you let it run for many hours, it'll eventually crash.

Additional information

It seems to be dependent on the image file (crash happens only with some image files, but consistently), although I can't tell what the pattern is. Filename, path, drive, etc all seem to make no difference (I can move and rename a file and the issue persists).

It also doesn't seem to change anything if there are other things in the file, or if the file has been saved previously.

Here's some example images and save files:
test_crash_save.zip