Push/Pull didn't do Lock Constraint correctly. Fixed.

Also added an isLockConstraint function that tells if the current constraint is a locking constraint or not.

source/blender/include/transform.h

@@ -275,6 +275,8 @@ void drawConstraint();
 //void drawPropCircle(TransInfo *t);
 void drawPropCircle();
 
+int isLockConstraint(TransInfo *t);
+
 void initConstraint(TransInfo *t);
 void startConstraint(TransInfo *t);
 void stopConstraint(TransInfo *t);

source/blender/src/transform.c

@@ -1988,7 +1988,14 @@ int PushPull(TransInfo *t, short mval[2])
 		VecSubf(vec, t->center, td->center);
 		if (t->con.applyRot && t->con.mode & CON_APPLY) {
 			t->con.applyRot(t, td, axis);
-			Projf(vec, vec, axis);
+			if (isLockConstraint(t)) {
+				float dvec[3];
+				Projf(dvec, vec, axis);
+				VecSubf(vec, vec, dvec);
+			}
+			else {
+				Projf(vec, vec, axis);
+			}
 		}
 		Normalise(vec);
 		VecMulf(vec, distance);

source/blender/src/transform_constraints.c

@@ -739,6 +739,21 @@ void BIF_drawPropCircle()
 	}
 }
 
+int isLockConstraint(TransInfo *t) {
+	int mode = t->con.mode;
+
+	if (mode & (CON_AXIS0|CON_AXIS1) == (CON_AXIS0|CON_AXIS1))
+		return 1;
+
+	if (mode & (CON_AXIS1|CON_AXIS2) == (CON_AXIS1|CON_AXIS2))
+		return 1;
+
+	if (mode & (CON_AXIS0|CON_AXIS2) == (CON_AXIS0|CON_AXIS2))
+		return 1;
+
+	return 0;
+}
+
 void initConstraint(TransInfo *t) {
 	if (t->con.mode & CON_APPLY) {
 		startConstraint(t);