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Internal Alignment constraint mirroring was never implemented. With the enhancements
brought with implementation of geometry extensions in the sketcher, this lack of
implementation became a crash, as geometry was marked as being internal alignment, while
no associated internal alignment constraint was created.
Restrictions:
- Internal alignment geometry is only to be mirrored if the geometry it defines is also
being mirrored. Internal alignment geometry is otherwise skipped. This is because it
does not make sense to have a pole without a b-spline, or a major axis of a ellipse without
an ellipse.
fixes#4514
63a0426952