Fix T71112: UILayout.activate_init when used in popups that refresh

Referenced by issue #71112, UI: support 'activate_init' for popups which refresh

source/blender/editors/interface/interface.c

@@ -889,6 +889,10 @@ bool UI_but_active_only(const bContext *C, ARegion *ar, uiBlock *block, uiBut *b
   return UI_but_active_only_ex(C, ar, block, but, true);
 }
 
+/**
+ * \warning This must run after other handlers have been added,
+ * otherwise the handler wont be removed, see: T71112.
+ */
 bool UI_block_active_only_flagged_buttons(const bContext *C, ARegion *ar, uiBlock *block)
 {
   bool done = false;

source/blender/windowmanager/intern/wm_operators.c

@@ -1467,8 +1467,6 @@ static uiBlock *wm_operator_ui_create(bContext *C, ARegion *ar, void *userData)
 
   UI_block_bounds_set_popup(block, 6 * U.dpi_fac, NULL);
 
-  UI_block_active_only_flagged_buttons(C, ar, block);
-
   return block;
 }