[TD]fix location of CV on rotated views

src/Mod/TechDraw/TechDrawTools/TaskAddOffsetVertex.py

@@ -28,6 +28,7 @@ __date__ = "2023/12/04"
 
 import FreeCAD as App
 import FreeCADGui as Gui
+import TechDraw
 
 from functools import partial
 
@@ -47,12 +48,17 @@ class TaskAddOffsetVertex():
 
     def accept(self):
         '''slot: OK pressed'''
-        point = self.vertex.Point
+        point = self.vertex.Point   # this is unscaled and inverted, but is also rotated.
+        # unrotate point. Note that since this is already unscaled, we need to set the
+        # third parameter to False to avoid an extra descaling.
+        point = TechDraw.makeCanonicalPoint(self.view, point, False);
         xOffset = self.form.dSpinBoxX.value()
         yOffset = self.form.dSpinBoxY.value()
-        offset = App.Vector(xOffset,yOffset,0)
+        offset = App.Vector(xOffset,yOffset,0)  # the offset is applied to the canonical
+                                                # point.  it is an unscaled, unrotated,
+                                                # uninverted relative value.
         self.view.makeCosmeticVertex(point+offset)
         Gui.Control.closeDialog()
 
     def reject(self):
-        return True
+        return True