It is possible to ask for splitting at an end point of the curve. This leads to
a `CADKernelError` and leaves us with a "hanging" clone. This check prevents that.
===================================
Changes from naked pointers to smart pointers are motivated to the use of functions that can reasonably throw under certain circumnstances (such as trim).
When introducing smart pointers, it is not necessary to explicitly delete the new geometry array at the end of the function.
When using the new facility to add a smart pointer geometry (previous commit), the copies generated in the split algorithm can be reused, which renders
keeping track of the new geometry for memory management unnecessary.
As geometry is added to the property which each call to addGeometry, the stored newIds can be reused if access is necessary to geometry pointers afterwards
(e.g. for constraint management).
================================================================
This new facility avoids to have to create a new copy() when a user copy is already created.
As the user copy is reused via move semantics, memory management is simplified.
CAVEAT: When this facility is used, the client code has to ensure whether a copy() or a clone() of the Part::Geometry
should be undertaken. The different between both is that the former creates a new uuid (tag), whereas the latter does not.
When `v == u` we want to "break" the b-spline at `u` (also OCC will raise an
exception if same parameter is provided).
The range of parameter can in general be different than 1.0, so use a general term.
=========================================================================
A migrated parabola cannot be openned with a previous version of FreeCAD. The user is notified upfront.
- the submenu ordering must be coherent to the one in the preferences combobox otherwise one gets the wrong orbit style displayed in the preferences dialog
- fix jumping direction field in dialogs
- apply default rotation to simple sections
- fix rounding error in vector widget
- remove "enter" button on CompassWidget
- add lost focus trap in event filter.
[TD]prevent recompute on cancel without change
Improve testability of installation code by refactoring it to completely
separate the GUI and non-GUI code, and to provide more robust support
for non-GUI access to some type of Addon Manager activity.
- boost check for planar graph was consuming memory until
crashing.
- since all our edges have been projected onto a plane, we
don't require this check
