Blender Git Loki

Fix T73286: Projection Painting Dense Mesh Bleed

When projection painting a dense mesh a face can be marked
PROJ_FACE_DEGENERATE when it is too small. Degenerative faces are
handled differently and as documented can create incorrect results.

Not sure what these incorrect results are and if there could be a better
solution for handling these results.

This fix would only mark a face degenerative when all the verts are the
same.

Reviewed By: Campbell Barton

Differential Revision: https://developer.blender.org/D7662