UI: Support defining UI lists in C

So far all UI lists had to be defined in Python, this makes it possible
to define them in C as well. Note that there is a whole bunch of special
handling for the Python API that isn't there for C. I think most
importantly custom properties support, which currently can't be added
for C defined UI lists.

The upcoming asset view UI template will use this, which needs to be
defined in C.

Adds a new file `interface_template_list.cc`, which at this point is
mostly a dummy to have a place for the `ED_uilisttypes_ui()` definition.
I plan a separate cleanup to move the UI-list template to that file.

1 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/makesrna/intern/rna_ui.c b/source/blender/makesrna/intern/rna_ui.c
index 2a076554d03..a88b100435a 100644
--- a/source/blender/makesrna/intern/rna_ui.c
+++ b/source/blender/makesrna/intern/rna_ui.c
@@ -654,7 +654,7 @@ static void uilist_filter_items(uiList *ui_list,
   RNA_parameter_list_free(&list);
 }
 
-static void rna_UIList_unregister(Main *UNUSED(bmain), StructRNA *type)
+static void rna_UIList_unregister(Main *bmain, StructRNA *type)
 {
   uiListType *ult = RNA_struct_blender_type_get(type);
 
@@ -665,7 +665,7 @@ static void rna_UIList_unregister(Main *UNUSED(bmain), StructRNA *type)
   RNA_struct_free_extension(type, &ult->rna_ext);
   RNA_struct_free(&BLENDER_RNA, type);
 
-  WM_uilisttype_freelink(ult);
+  WM_uilisttype_remove_ptr(bmain, ult);
 
   /* update while blender is running */
   WM_main_add_notifier(NC_WINDOW, NULL);