From 8867cfc563bd8432aafb4e28cebb0f67a4b014ca Mon Sep 17 00:00:00 2001
From: Pratik Borhade <pratikborhade302@gmail.com>
Date: Tue, 17 Oct 2023 12:39:01 +0200
Subject: [PATCH] Fix #113778: Skip unlinking a linked collection if parent is
 linked

Similar to 197f3d75d1, do not unlink a linked collection from a linked parent

Pull Request: https://projects.blender.org/blender/blender/pulls/113805
---
 source/blender/editors/space_outliner/outliner_tools.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/source/blender/editors/space_outliner/outliner_tools.cc b/source/blender/editors/space_outliner/outliner_tools.cc
index 179a71f2985..8d654b80c73 100644
--- a/source/blender/editors/space_outliner/outliner_tools.cc
+++ b/source/blender/editors/space_outliner/outliner_tools.cc
@@ -393,6 +393,15 @@ static void unlink_collection_fn(bContext *C,
     return;
   }
 
+  if (tsep && (ID_IS_LINKED(tsep->id) || ID_IS_OVERRIDE_LIBRARY(tsep->id))) {
+    BKE_reportf(reports,
+                RPT_WARNING,
+                "Cannot unlink collection '%s' parented to another linked collection '%s'",
+                collection->id.name + 2,
+                tsep->id->name + 2);
+    return;
+  }
+
   if (tsep) {
     if (GS(tsep->id->name) == ID_OB) {
       Object *ob = (Object *)tsep->id;