d0089e6fe1
This implements the _automerge_ feature which finds nearby end points during stroke draw and merges the new curve with existing strokes. New utility functions are added in `geometry` for slightly generalized functionality. The `curves_merge_endpoints` takes an index map that describes how to connect curves by index. It performs a topological sort and reorders connected curves into contiguous ranges. This can be used with an arbitrary number of connected curves. The tool feature itself only uses a single curve, based on 2D end point positions. Unit tests have been added for the curve merge utility function. Pull Request: https://projects.blender.org/blender/blender/pulls/124459
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