What is the right approach for handling command deactivation?
There seem to be different situations in FreeCAD when command can be deactivated:
- Command can be cancelled
- Command can be interrupted due to another command started
- Command can finish the work
- Probably some other situations...
When command is being deactivated, it is a good time to free some resources, acquired by the command. Like: event callbacks, selectionObserver, temporary objects.
How to write commands properly to avoid situations when some resources leak?
Many thanks
