Here's the most recent bugfix I had to make, along with a fairly lengthy but still incomplete post-mortem in the commit description.

Still several things left to investigate.

• Really small windows probably crash.
• Really wide and short windows probably crash.
• Pressing and releasing mouse really quickly within a single frame will probably crash.

I want to delete some data structures and just recompute them all the time.

This post is part of my Freewheeling Apps Devlog.

Comments gratefully appreciated. Please send them to me by any method of your choice and I'll include them here.