[Bf-blender-cvs] [2283b6ef692] master: Fix the session UUID being set for temporary blend file data

[Campbell Barton]

Commit: 2283b6ef6928c2ce0bfe283a9c4744a113412574
Author: Campbell Barton
Date:   Tue Mar 9 23:46:14 2021 +1100
Branches: master
https://developer.blender.org/rB2283b6ef6928c2ce0bfe283a9c4744a113412574

Fix the session UUID being set for temporary blend file data

Triggered by temporarily appending library linked data from Python.

===================================================================

M	source/blender/blenkernel/intern/lib_id.c

===================================================================

diff --git a/source/blender/blenkernel/intern/lib_id.c b/source/blender/blenkernel/intern/lib_id.c
index f3a1c01ad26..af921307bfb 100644
--- a/source/blender/blenkernel/intern/lib_id.c
+++ b/source/blender/blenkernel/intern/lib_id.c
@@ -171,7 +171,9 @@ static void lib_id_clear_library_data_ex(Main *bmain, ID *id)
 
   /* Conceptually, an ID made local is not the same as the linked one anymore. Reflect that by
    * regenerating its session UUID. */
-  BKE_lib_libblock_session_uuid_renew(id);
+  if ((id->tag & LIB_TAG_TEMP_MAIN) == 0) {
+    BKE_lib_libblock_session_uuid_renew(id);
+  }
 
   /* We need to tag this IDs and all of its users, conceptually new local ID and original linked
    * ones are two completely different data-blocks that were virtually remapped, even though in