8ebeafa6b9
Previously in 43fde8c39c the point span
for calling `extend_curves_straight` was set to a fixed `{1}` with only
1 element, this causes index access to go out of range, which is the
cause of crash #135586. However there are some other issues within the
code path, mainly:
- The meaning of `start/end_points` are unclear
- Behaviour of extending a 2-point stroke is undefined
This PR clarifies these by adding some comments and change a bit of the
logic in the code so it's more understandable.
Pull Request: https://projects.blender.org/blender/blender/pulls/135608
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