Merge pull request #4780 from matthijskooijman/fix-flat-groups-section-view

Arch: Fix section view duplicate rendering of items in groups with only flat objects

src/Mod/Arch/ArchSectionPlane.py

@@ -375,9 +375,12 @@ def getSVG(source,
                 drafts.append(o)
         elif o.isDerivedFrom("Part::Part2DObject"):
             drafts.append(o)
+        elif o.isDerivedFrom("App::DocumentObjectGroup"):
+            # These will have been expanded by getSectionData already
+            pass
         elif looksLikeDraft(o):
             drafts.append(o)
-        elif not o.isDerivedFrom("App::DocumentObjectGroup"):
+        else:
             nonspaces.append(o)
         if Draft.getType(o.getLinkedObject()) == "Window":  # To support Link of Windows(Doors)
             windows.append(o)

src/Mod/Draft/draftutils/groups.py

@@ -197,8 +197,8 @@ def get_group_contents(objectslist,
 
     spaces: bool, optional
         It defaults to `False`.
-        If it is `True`, Arch Spaces are treated as groups,
-        and are added to the output list.
+        If it is `True`, Arch Spaces are added to the output list even
+        when addgroups is False (their contents are always added).
 
     noarchchild: bool, optional
         It defaults to `False`.