From c8cf0a1e32246aa5cedc7f7fa940d83970c413a6 Mon Sep 17 00:00:00 2001
From: "Zheng, Lei" <realthunder.dev@gmail.com>
Date: Sat, 4 Jul 2020 21:24:23 +0800
Subject: [PATCH] gui: fix infinite recursion triggered by auto element
 visibility

---
 freecad/asm3/gui.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/freecad/asm3/gui.py b/freecad/asm3/gui.py
index a89e1e8..169683a 100644
--- a/freecad/asm3/gui.py
+++ b/freecad/asm3/gui.py
@@ -38,9 +38,13 @@ class SelectionObserver:
             res = sobj.Proxy.parent.Object.isElementVisible(sobj.Name)
             if res and vis:
                 return False
+            if not res and not vis:
+                return;
             sobj.Proxy.parent.Object.setElementVisible(sobj.Name,vis)
         elif isTypeOf(sobj,AsmConstraint):
             vis = [vis] * len(flattenGroup(sobj))
+            if sobj.VisibilityList == tuple(vis):
+                return
             sobj.setPropertyStatus('VisibilityList','-Immutable')
             sobj.VisibilityList = vis
             sobj.setPropertyStatus('VisibilityList','Immutable')