Draft: improved IsActive behavior (#14103)

Related issue: #14061.

src/Mod/Draft/draftutils/gui_utils.py

@@ -59,19 +59,23 @@ def get_3d_view():
     Returns
     -------
     Gui::View3DInventor
-        Return the current `ActiveView` in the active document or `None`.
+        The Active 3D View or `None`.
     """
-    if App.GuiUp:
-        # FIXME The following two imports were added as part of PR4926
-        # Also see discussion https://forum.freecad.org/viewtopic.php?f=3&t=60251
-        import FreeCADGui as Gui
-        from pivy import coin
-        if Gui.ActiveDocument:
-            v = Gui.ActiveDocument.ActiveView
-            if "View3DInventor" in str(type(v)):
-                return v
+    if not App.GuiUp:
+        return None
 
-    return None
+    # FIXME The following two imports were added as part of PR4926
+    # Also see discussion https://forum.freecadweb.org/viewtopic.php?f=3&t=60251
+    import FreeCADGui as Gui
+    from pivy import coin
+
+    mw = Gui.getMainWindow()
+    view = mw.getActiveWindow()
+    if view is None:
+        return None
+    if not hasattr(view, "getSceneGraph"):
+        return None
+    return view
 
 
 get3DView = get_3d_view