[TD]use correct property type for directions

src/Mod/TechDraw/App/DrawViewPart.cpp

@@ -1042,6 +1042,7 @@ bool DrawViewPart::hasGeometry() const
 
     const std::vector<TechDraw::VertexPtr>& verts = getVertexGeometry();
     const std::vector<TechDraw::BaseGeomPtr>& edges = getEdgeGeometry();
+
     return !(verts.empty() && edges.empty());
 }
 
@@ -1477,6 +1478,33 @@ void DrawViewPart::resetReferenceVerts()
     addReferencesToGeom();
 }
 
+void DrawViewPart::handleChangedPropertyType(Base::XMLReader &reader, const char * TypeName, App::Property * prop)
+{
+    if (prop == &Direction) {
+        // Direction was PropertyVector but is now PropertyDirection
+        App::PropertyVector tmp;
+        if (strcmp(tmp.getTypeId().getName(), TypeName)==0) {
+            tmp.setContainer(this);
+            tmp.Restore(reader);
+            auto tmpValue = tmp.getValue();
+            Direction.setValue(tmpValue);
+        }
+        return;
+    }
+
+    if (prop == &XDirection) {
+        // XDirection was PropertyFloat but is now PropertyLength
+        App::PropertyVector tmp;
+        if (strcmp(tmp.getTypeId().getName(), TypeName)==0) {
+            tmp.setContainer(this);
+            tmp.Restore(reader);
+            auto tmpValue = tmp.getValue();
+            XDirection.setValue(tmpValue);
+        }
+        return;
+    }
+}
+
 // debugging ----------------------------------------------------------------------------
 
 void DrawViewPart::dumpVerts(std::string text)

src/Mod/TechDraw/App/DrawViewPart.h

@@ -90,9 +90,8 @@ public:
 
     App::PropertyLinkList Source;
     App::PropertyXLinkList XSource;
-    App::PropertyVector
-        Direction;//TODO: Rename to YAxisDirection or whatever this actually is  (ProjectionDirection)
-    App::PropertyVector XDirection;
+    App::PropertyDirection Direction;  // the projection direction
+    App::PropertyDirection XDirection;
     App::PropertyBool Perspective;
     App::PropertyDistance Focus;
 
@@ -115,6 +114,8 @@ public:
     App::DocumentObjectExecReturn* execute() override;
     const char* getViewProviderName() const override { return "TechDrawGui::ViewProviderViewPart"; }
     PyObject* getPyObject() override;
+    void handleChangedPropertyType(
+        Base::XMLReader &reader, const char * TypeName, App::Property * prop) override;
 
     static TopoDS_Shape centerScaleRotate(const DrawViewPart* dvp, TopoDS_Shape& inOutShape,
                                           Base::Vector3d centroid);