FS#1928 - Optionnally 'Auto clean up' after generation of NaN / Null / Null-lenght ... properties.
Some functions / methods can generate some sort off entity or part with NaN / Null / Null-lenght ... props.
Some explicitly don’t and test their actions with isNull().
As these serve a purpose in some processes, trails of them can be part of the results.
For some users Null / Null-lenght are meaningfull, for other users these produce errors down the line.
In a few cases its a desirable feature eg. controlpoint spline.
(Allthough there are no Null props involved with equal successively controlpoints)
Many problem post on the forum are related to Null - Zero and so on.
In some cases it can’t be undone by re-editing the drawing.
https://qcad.org/bugtracker/index.php?do=details&task_id=1925
If it can’t be undone by Undo/Redo it is a bug.
https://qcad.org/bugtracker/index.php?do=details&task_id=1757
In some cases there is a difference noticed after file save-close-open.