+ check returned mdi view to be of the requested type

src/Gui/ViewProviderDocumentObject.h

@@ -90,10 +90,24 @@ public:
     //@}
 
 protected:
-    /// Get the active mdi view of a view provider
+    /*! Get the active mdi view of the document this view provider is part of.
+      @note The returned mdi view doesn't need to be a 3d view but can be e.g.
+      an image view, an SVG view or something else.
+     */
     Gui::MDIView* getActiveView() const;
-    /// Get the editing mdi view of a view provider in edit mode
+    /*! Get the mdi view of the document this view provider is part of and
+      that is in editing mode.
+      @note In case there is no mdi view in editing mode 0 is returned.
+      If a value different to 0 is returned it is guaranteed to be a 3d view.
+     */
     Gui::MDIView* getEditingView() const;
+    /*! Get any mdi view of the document this view provider is part of.
+      In case there is an mdi view in editing mode that contains this
+      view provider that mdi view is returned. Otherwise any other
+      3d view that contains this view provider is returned.
+      If a value different to 0 is returned it is guaranteed to be a 3d view.
+     */
+    Gui::MDIView* getInventorView() const;
     /// Gets called by the container whenever a property has been changed
     virtual void onChanged(const App::Property* prop);
     /** Searches in all view providers that are attached to an object that