Tracking: support editing all selected tracks

This patch adds a "selected_movieclip_tracks" context member and enables
editing properties of multiple selected tracks via the usual Alt-click
editing (as well as the "Copy To Selected" operator). Both use
UI_context_copy_to_selected_list() to gather a list of other selected
items [which are now taken via said new context member]. Strictly
speaking, this could be done without the context member as well [just
gathering other selected tracks in UI_context_copy_to_selected_list()
without relying on a context member], but this might come in handy in
other places (e.g. Addons).

note: some could be desired for markers (e.g. editing pattern/search
areas of all selected track markers, but since this is burried in a
uiTemplate, this is a bit more work for another patch).

Differential Revision: https://developer.blender.org/D12923

1 files changed, 3 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_ops.c b/source/blender/editors/interface/interface_ops.c
index 423950d4dbd..69a3cc959c9 100644
--- a/source/blender/editors/interface/interface_ops.c
+++ b/source/blender/editors/interface/interface_ops.c
@@ -849,6 +849,9 @@ bool UI_context_copy_to_selected_list(bContext *C,
   else if (RNA_struct_is_a(ptr->type, &RNA_NlaStrip)) {
     *r_lb = CTX_data_collection_get(C, "selected_nla_strips");
   }
+  else if (RNA_struct_is_a(ptr->type, &RNA_MovieTrackingTrack)) {
+    *r_lb = CTX_data_collection_get(C, "selected_movieclip_tracks");
+  }
   else if (RNA_struct_is_a(ptr->type, &RNA_Constraint) &&
            (path_from_bone = RNA_path_resolve_from_type_to_property(ptr, prop, &RNA_PoseBone)) !=
                NULL) {