Selecing a pose bone in outliner deselect others

This mimics what is now the behaviour for edit bones as well.
See e6151bc4c1f2.

And it also matches what we do in the viewport when selecting bones.

1 files changed, 20 insertions, 4 deletions

diff --git a/source/blender/editors/space_outliner/outliner_select.c b/source/blender/editors/space_outliner/outliner_select.c
index d4243da5b1e..9866b43a6a6 100644
--- a/source/blender/editors/space_outliner/outliner_select.c
+++ b/source/blender/editors/space_outliner/outliner_select.c
@@ -586,11 +586,27 @@ static eOLDrawState tree_element_active_posechannel(
 		if (!(pchan->bone->flag & BONE_HIDDEN_P)) {
 
 			if (set != OL_SETSEL_EXTEND) {
-				bPoseChannel *pchannel;
-				/* single select forces all other bones to get unselected */
-				for (pchannel = ob->pose->chanbase.first; pchannel; pchannel = pchannel->next) {
-					pchannel->bone->flag &= ~(BONE_TIPSEL | BONE_SELECTED | BONE_ROOTSEL);
+				/* Single select forces all other bones to get unselected. */
+				uint objects_len = 0;
+				Object **objects = BKE_view_layer_array_from_objects_in_mode_unique_data(view_layer, NULL, &objects_len, OB_MODE_POSE);
+				for (uint object_index = 0; object_index < objects_len; object_index++) {
+					Object *ob_iter = BKE_object_pose_armature_get(objects[object_index]);
+
+					/* Sanity checks. */
+					if (ELEM(NULL, ob_iter, ob_iter->pose, ob_iter->data)) {
+						continue;
+					}
+
+					bPoseChannel *pchannel;
+					for (pchannel = ob_iter->pose->chanbase.first; pchannel; pchannel = pchannel->next) {
+						pchannel->bone->flag &= ~(BONE_TIPSEL | BONE_SELECTED | BONE_ROOTSEL);
+					}
+
+					if (ob != ob_iter) {
+						DEG_id_tag_update(ob_iter->data, ID_RECALC_SELECT);
+					}
 				}
+				MEM_freeN(objects);
 			}
 
 			if ((set == OL_SETSEL_EXTEND) && (pchan->bone->flag & BONE_SELECTED)) {