Blender Git Loki

Fix T70455: Knife Tool failing to cut edges

Analyzing the cuts, the points shown in the viewport (indicating the
previous and current cuts) do not correspond to the final cuts.

Sometimes a point, even snapped to a vert, is a point that cuts an edge and
sometimes a point, even snapped to an edge, is a point that cuts only the face.

This is because the detection of snapping vertices from mouse is different
from the "snap" that detects vertices that are cut.

So small projection inaccuracies can result in detection failures.

The solution for this is simply to confirm the cuts whose vertices
indicate the `prev` ou and `cur` point.

The tolerance distance does not need to be calculated in these cases.