gui: fix tree item move command

gui.py

@@ -277,15 +277,17 @@ class AsmCmdUp(AsmCmdBase):
         logger.debug('move {}:{} -> {}:{}'.format(
             i,objName(obj),j,objName(children[j])))
         parent.Document.openTransaction(cls._menuText)
+        readonly = 'Immutable' in parent.getPropertyStatus('Group')
+        if readonly:
+            parent.setPropertyStatus('Group','-Immutable')
         parent.Group = {i:children[j],j:obj}
+        if readonly:
+            parent.setPropertyStatus('Group','Immutable')
         parent.Document.commitTransaction()
         # The tree view may deselect the item because of claimChildren changes,
         # so we restore the selection here
         FreeCADGui.Selection.addSelection(topParent,subname)
 
-        if AsmCmdManager.AutoRecompute:
-            parent.Proxy.solve()
-
     @classmethod
     def onClearSelection(cls):
         cls._active = False