Deleting a workplane with an arc locked to it crashes SolveSpace #628
Description
System information
SolveSpace version: 3.0~225f82a2
Operating system: Arch
Actual behavior
After constructing a new workplane inside an existing group and constructing an arc on that workplane, SolveSpace crashes when deleting the workplane.
Additional information
Example file with conditions already set up. Deleting r0004-workplane crashes SolveSpace.
workplane_arc.zip