Blender Git Loki

Workaround #29205: Crash while using Edge Split modifier (while rotating vertices in edit mode with edge split viewable)

This bug is caused by exactly the same reason as #26316: differences in how new vertices/edges
are getting calculated first and how they're adding later. In some cases extra vertices are
creating which weren't counted before.

This patch prevents crash in such situations, but result mesh can be a bit wrong.
This should work fine in bmesh, so think it's acceptable to have such workaround
before actual fix coming with bmesh.