html_int: implement int.dnd_reorder_tabindex()

src/html_interactivity.ts

@@ -635,6 +635,14 @@ export class Interactive {
         this.dragAndDropHandler?.setData(data);
     }
 
+    /**
+    * reorder the tabindex of the containers
+    * @param container_names 
+    */
+    public dnd_reorder_tabindex(container_names: string[]){
+        this.dragAndDropHandler?.reorder_svg_container_tabindex(container_names);
+    }
+
     /**
     * Get the content size of a container
     */
@@ -1508,6 +1516,14 @@ class DragAndDropHandler {
             }
         }
     }
+
+    public reorder_svg_container_tabindex(container_names: string[]){
+        for (let container_name of container_names) {
+            const g = this.get_container_outer_g(container_name);
+            if (g == undefined) continue;
+            this.dnd_svg.appendChild(g);
+        }
+    }
 
     reposition_container_content(container_name : string){
         let container = this.containers[container_name];