[Bf-blender-cvs] [f7018f7b06f] master: Fix T94544: crash removing image used as camera background via python

[Philipp Oeser]

Commit: f7018f7b06f9283ed8ddc169234ef5a543cbaaf1
Author: Philipp Oeser
Date:   Tue Jan 4 10:25:12 2022 +0100
Branches: master
https://developer.blender.org/rBf7018f7b06f9283ed8ddc169234ef5a543cbaaf1

Fix T94544: crash removing image used as camera background via python

Since 2.8, background images are tied to cameras (in 2.79 these were
tied to a View3D I think).
Code in `BKE_library_id_can_use_idtype` wasnt taking this relation
between `Camera` and `Image` into account, thus leading to ID deletion/
unlinking not working properly -- in particular `libblock_remap_data`
not doing its thing (and leaving the camera as a user of the image),
then things went downhill from there...

Now make the "Camera-can-use-an-Image" relation clear in
`BKE_library_id_can_use_idtype`.

Maniphest Tasks: T94544

Differential Revision: https://developer.blender.org/D13722

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

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

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

diff --git a/source/blender/blenkernel/intern/lib_query.c b/source/blender/blenkernel/intern/lib_query.c
index 4ad0186f9b5..1f20a84098c 100644
--- a/source/blender/blenkernel/intern/lib_query.c
+++ b/source/blender/blenkernel/intern/lib_query.c
@@ -439,7 +439,7 @@ bool BKE_library_id_can_use_idtype(ID *id_owner, const short id_type_used)
     case ID_LA:
       return (ELEM(id_type_used, ID_TE));
     case ID_CA:
-      return ELEM(id_type_used, ID_OB);
+      return ELEM(id_type_used, ID_OB, ID_IM);
     case ID_KE:
       /* Warning! key->from, could be more types in future? */
       return ELEM(id_type_used, ID_ME, ID_CU, ID_LT);