Blender Git Loki

Fix T86968: Last UV factor in cyclic strokes

The UV factor of the last point of a cyclic stroke was using the factor of
the first point leading to unwanted scaling artifacts.

The fix sets the uv factor of the last point to the currect value (last UV
factor + length between last and first point).

Reviewed By: antoniov, fclem

Maniphest Tasks: T86968

Differential Revision: https://developer.blender.org/D10850