Outliner: allow "Show Active" to center/scroll in Data API view

Unlike other Outliner views, this will not open up elements to find
objects "underneath" (since Data API view lazy loads elements iirc), but
given that you already have that object visible somewhere in the DataAPI
view (so e.g. Objects expanded) we could actually do the centering/
scrolling by getting an ID from the `TreeElement` (in case of an
`TSE_RNA_STRUCT`).

This came up in #145904

Pull Request: https://projects.blender.org/blender/blender/pulls/145920

source/blender/editors/space_outliner/outliner_utils.cc

@@ -31,6 +31,7 @@
 
 #include "outliner_intern.hh"
 #include "tree/tree_display.hh"
+#include "tree/tree_element_rna.hh"
 
 namespace blender::ed::outliner {
 
@@ -195,6 +196,19 @@ TreeElement *outliner_find_id(SpaceOutliner *space_outliner, ListBase *lb, const
         return te;
       }
     }
+    else if (tselem->type == TSE_RNA_STRUCT) {
+      /* No ID, so check if entry is RNA-struct, and if that RNA-struct is an ID datablock we are
+       * good. */
+      const TreeElementRNAStruct *te_rna_struct = tree_element_cast<TreeElementRNAStruct>(te);
+      if (te_rna_struct) {
+        const PointerRNA &ptr = te_rna_struct->get_pointer_rna();
+        if (RNA_struct_is_ID(ptr.type)) {
+          if (static_cast<ID *>(ptr.data) == id) {
+            return te;
+          }
+        }
+      }
+    }
 
     TreeElement *tes = outliner_find_id(space_outliner, &te->subtree, id);
     if (tes) {