20b19f2b12
This fixes a crash where merging vertices by distance leads to a crash since
0652945dbd. The change did not cause
the bug though, it just made the underlying issue visible.
The issue was that `kdtree_order` assumed that the `KDTreeNode.index` didn't
have gaps, i.e. every index in a certain range is used. However, that is not the
case when only a subset of the vertices of a mesh are added to the kdtree.
Pull Request: https://projects.blender.org/blender/blender/pulls/107535
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