Proxies Removal: Handle conversion to liboverrides also for linked data.

So far linked proxies were just kept as-is, this is no longer an option.

Attempt to convert them into liboverrides as much as possible, though
some cases won't be supported:
- Appending proxies is broken since a long time, so conversion will fail
  here as well.
- When linking data, some cases will fail to convert properly. in
  particular, if the linked proxy object is not instanced in a scene
  (e.g. when linking a collection containing a proxy as an
  epty-instanced collection instead of a view-layer-instanced collection).

NOTE: converion when linking/appending is done unconditionnaly, option
to not convert on file load will be removed in next commit anyway.

Part of T91671.

1 files changed, 24 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/blendfile_link_append.c b/source/blender/blenkernel/intern/blendfile_link_append.c
index 9b3f4c2fae8..4149821b67b 100644
--- a/source/blender/blenkernel/intern/blendfile_link_append.c
+++ b/source/blender/blenkernel/intern/blendfile_link_append.c
@@ -993,6 +993,24 @@ static int foreach_libblock_link_append_callback(LibraryIDLinkCallbackData *cb_d
 /** \name Library link/append code.
  * \{ */
 
+static void blendfile_link_append_proxies_convert(Main *bmain, ReportList *reports)
+{
+  BlendFileReadReport bf_reports = {.reports = reports};
+  BKE_lib_override_library_main_proxy_convert(bmain, &bf_reports);
+
+  if (bf_reports.count.proxies_to_lib_overrides_success != 0 ||
+      bf_reports.count.proxies_to_lib_overrides_failures != 0) {
+    BKE_reportf(
+        bf_reports.reports,
+        RPT_WARNING,
+        "Proxies have been removed from Blender (%d proxies were automatically converted "
+        "to library overrides, %d proxies could not be converted and were cleared). "
+        "Please consider re-saving any library .blend file with the newest Blender version.",
+        bf_reports.count.proxies_to_lib_overrides_success,
+        bf_reports.count.proxies_to_lib_overrides_failures);
+  }
+}
+
 void BKE_blendfile_append(BlendfileLinkAppendContext *lapp_context, ReportList *reports)
 {
   if (lapp_context->num_items == 0) {
@@ -1259,6 +1277,8 @@ void BKE_blendfile_append(BlendfileLinkAppendContext *lapp_context, ReportList *
   }
 
   BKE_main_id_newptr_and_tag_clear(bmain);
+
+  blendfile_link_append_proxies_convert(bmain, reports);
 }
 
 void BKE_blendfile_link(BlendfileLinkAppendContext *lapp_context, ReportList *reports)
@@ -1361,6 +1381,10 @@ void BKE_blendfile_link(BlendfileLinkAppendContext *lapp_context, ReportList *re
                                                        .active_collection = NULL};
     loose_data_instantiate(&instantiate_context);
   }
+
+  if ((lapp_context->params->flag & FILE_LINK) != 0) {
+    blendfile_link_append_proxies_convert(lapp_context->params->bmain, reports);
+  }
 }
 
 /** \} */