Draft: Fix Draft_SelectPlane ignores nesting

src/Mod/Draft/WorkingPlane.py

@@ -521,7 +521,7 @@ class Plane:
         self.v = v2
         self.axis = v3
 
-    def alignToFace(self, shape, offset=0):
+    def alignToFace(self, shape, offset=0, parent=None):
         """Align the plane to a face.
 
         It uses the center of mass of the face as `position`,
@@ -542,6 +542,10 @@ class Plane:
             Defaults to zero. A value which will be used to offset
             the plane in the direction of its `axis`.
 
+        parent : object
+            Defaults to None. The ParentGeoFeatureGroup of the object
+            the face belongs to.
+
         Returns
         -------
         bool
@@ -554,17 +558,21 @@ class Plane:
         """
         # Set face to the unique selected face, if found
         if shape.ShapeType == 'Face':
-            self.alignToPointAndAxis(shape.Faces[0].CenterOfMass,
-                                     shape.Faces[0].normalAt(0, 0),
-                                     offset)
+            if parent:
+                place = parent.getGlobalPlacement()
+            else:
+                place = FreeCAD.Placement()
+            cen = place.multVec(shape.Faces[0].CenterOfMass)
+            place.Base = FreeCAD.Vector(0, 0, 0) # Reset the Base for the conversion of the normal.
+            nor = place.multVec(shape.Faces[0].normalAt(0, 0))
+            self.alignToPointAndAxis(cen, nor, offset)
             import DraftGeomUtils
             q = DraftGeomUtils.getQuad(shape)
             if q:
-                self.u = q[1]
-                self.v = q[2]
+                self.u = place.multVec(q[1])
+                self.v = place.multVec(q[2])
                 if not DraftVecUtils.equals(self.u.cross(self.v), self.axis):
-                    self.u = q[2]
-                    self.v = q[1]
+                    self.u, self.v = self.v, self.u
                 if DraftVecUtils.equals(self.u, Vector(0, 0, 1)):
                     # the X axis is vertical: rotate 90 degrees
                     self.u, self.v = self.v.negative(), self.u