[ArchSectionPlane] Fix Swing Symbol for Windows(Doors) Link in ArchView/TechDraw

Forum Discussion  :  [ Link in Arch/BIM -- 4 ] Link of Door : Swing Not Shown in ArchView/TechDraw
- https://forum.freecadweb.org/viewtopic.php?f=23&t=55526

src/Mod/Arch/ArchSectionPlane.py

@@ -379,7 +379,7 @@ def getSVG(source,
             drafts.append(o)
         elif not o.isDerivedFrom("App::DocumentObjectGroup"):
             nonspaces.append(o)
-        if Draft.getType(o) == "Window":
+        if Draft.getType(o.getLinkedObject()) == "Window":  # To support Link of Windows(Doors)
             windows.append(o)
     objs = nonspaces
 
@@ -580,11 +580,12 @@ def getSVG(source,
     if windows:
         sh = []
         for w in windows:
-            if not hasattr(w.Proxy,"sshapes"):
-                w.Proxy.execute(w)
-            if hasattr(w.Proxy,"sshapes"):
-                if w.Proxy.sshapes and (w.Name in cutwindows):
-                    c = Part.makeCompound(w.Proxy.sshapes)
+            wlo = w.getLinkedObject()  # To support Link of Windows(Doors)
+            if not hasattr(wlo.Proxy,"sshapes"):
+                wlo.Proxy.execute(wlo)
+            if hasattr(wlo.Proxy,"sshapes"):
+                if wlo.Proxy.sshapes and (w.Name in cutwindows):
+                    c = Part.makeCompound(wlo.Proxy.sshapes)
                     c.Placement = w.Placement
                     sh.append(c)
             # buggy for now...