Preselection is sometimes not updated under some circumstances
1. when deleting an object through python;
2. before autoconstraint when deleting previous pole in bspline creation mode.
When the preselected curve is the deleted object, segfault/crash can happen.
Current V-bit totally hangs FC when cutting edge height is zero. Tip diameter of zero also causes errors.
These two tool shapes add 1um offsets to various dimensions to prevent user entered parameters from inducing zero dimensions which make the solver barf.
The rotational geometry has also been simplified.
Some are non critical but tip diam increment is a work around. To be rigorous, the fixed value such ideally be relative to some dimension of the job, not the arbitrary constant. Hopefully 1um will be suitable for most FC applications unless someone is doing uv lithography masks ;)
https://forum.freecadweb.org/viewtopic.php?f=15&t=54880&p=479739#p479739
This replaces earlier PR where these files were not uploaded.
https://github.com/FreeCAD/FreeCAD/pull/4491
If package.xml metadata file exists, it is scanned for FreeCAD version
compatibility before the Addon is loaded. If the Addon specifies that it is
explicitly not compatible with the current version of FreeCAD, the Addon is
not loaded.