Fix T101964: Edge and face snapping no locking to axis

In rBed6c8d82b804 it was wrongly assumed that the constraint functions
always apply the transformations.

But that is not the case for when axes are aligned.

The `mul_m3_v3(t->con.pmtx, out)` fallback is still required.

1 files changed, 6 insertions, 9 deletions

diff --git a/source/blender/editors/transform/transform_constraints.c b/source/blender/editors/transform/transform_constraints.c
index fa56456d8e7..7abf0e5c00c 100644
--- a/source/blender/editors/transform/transform_constraints.c
+++ b/source/blender/editors/transform/transform_constraints.c
@@ -404,9 +404,11 @@ static void applyAxisConstraintVec(const TransInfo *t,
       }
     }
 
+    /* Fallback for when axes are aligned. */
+    mul_m3_v3(t->con.pmtx, out);
+
     if (is_snap_to_point) {
-      /* With snap points, a projection is alright, no adjustments needed. */
-      mul_m3_v3(t->con.pmtx, out);
+      /* Pass. With snap points, a projection is alright, no adjustments needed. */
     }
     else {
       const int dims = getConstraintSpaceDimension(t);
@@ -422,14 +424,9 @@ static void applyAxisConstraintVec(const TransInfo *t,
             /* Disabled, as it has not proven to be really useful. (See T82386). */
             // constraint_snap_plane_to_face(t, plane, out);
           }
-          else {
+          else if (!isPlaneProjectionViewAligned(t, plane)) {
             /* View alignment correction. */
-            if (!isPlaneProjectionViewAligned(t, plane)) {
-              planeProjection(t, plane, in, out);
-            }
-            else {
-              mul_m3_v3(t->con.pmtx, out);
-            }
+            planeProjection(t, plane, in, out);
           }
         }
       }