Restore secondary ortho view movement to v017 style

- this should also complete the fix for #3809

src/Mod/TechDraw/Gui/ViewProviderDrawingView.cpp

@@ -66,7 +66,8 @@ ViewProviderDrawingView::ViewProviderDrawingView()
 
     ADD_PROPERTY_TYPE(KeepLabel ,(false),group,App::Prop_None,"Keep Label on Page even if toggled off");
 
-    // Do not show in property editor   why? wf
+    // Do not show in property editor   why? wf  WF: because DisplayMode applies only to coin and we
+    // don't use coin.
     DisplayMode.setStatus(App::Property::ReadOnly,true);
     m_docReady = true;
 }