929 and 930 bug: opening a path makes it invisible

There’s a rare, weird bug in 929 and 930 that can make a path invisible. Use the Draw tool to open a closed path by clicking on two points and occasionally the path disappears. Sometimes the path does not become invisible immediately, but does disappear if I then switch to the select tool. This rarely happens, but it always happens with certain paths. It never happens in 895.

I fixed that. Update is coming.