Outliner: Use UI names and grouping for library overrides properties

NOTE: This is committed to the 3.3 branch as decided by Bastien, Dalai
and me. That is because these are important usability fixes/improvements
to have for the LTS release.

Part of T95802.

Showing properties with an RNA path in the UI isn't very user friendly.
Instead, represent the RNA path as a tree, merging together parts of the
RNA path that are shared by multiple properties. Properties and "groups"
(RNA structs/pointers) are now shown with their UI name and an icon if
any. The actually overridden properties still show the Library Overrides
icon. See the patch for screenshots.

Also: When a RNA collection item, like a modifier or constraint was
added via a library override, indicate that item and show all collection
items in the list, since the complete list of items and their orders may
be important context.

Differential Revision: https://developer.blender.org/D15606

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/makesdna/DNA_outliner_types.h b/source/blender/makesdna/DNA_outliner_types.h
index f7a4dbc83d5..489fb6917e8 100644
--- a/source/blender/makesdna/DNA_outliner_types.h
+++ b/source/blender/makesdna/DNA_outliner_types.h
@@ -113,7 +113,8 @@ typedef enum eTreeStoreElemType {
   TSE_GPENCIL_EFFECT_BASE = 42,
   TSE_GPENCIL_EFFECT = 43,
   TSE_LIBRARY_OVERRIDE_BASE = 44,
-  TSE_LIBRARY_OVERRIDE = 45,
+  TSE_LIBRARY_OVERRIDE = 45,           /* No ID */
+  TSE_LIBRARY_OVERRIDE_OPERATION = 46, /* No ID */
   TSE_GENERIC_LABEL = 47,              /* No ID */
 } eTreeStoreElemType;