### Godot version

v4.1.1.stable.official [bd6af8e0e]

### System information

Godot v4.1.1.stable - Debian GNU/Linux trixie/sid trixie - Vulkan (Compatibility) - Mesa Intel(R) HD Graphics 520 (SKL GT2) () - Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz (4 Threads)

### Issue description

After right clicking in thet "Filter Nodes" menu in the scene tree dock, the sub-menu is populated with a "Search" icon.

If I later switch themes in the same session, this icon is never updated to match the new theme.

![image](https://github.com/godotengine/godot/assets/660911/14336bb3-12ca-48c8-b030-8ada6ac27ec6)


### Steps to reproduce

1. Right click in the "Filter Nodes" menu in scene tree dock
2. Switch themes
3. Right click again in the "Filter Nodes" menu

Expected result: Icon has updated to match the theme I am currently using
Actual result: Icon is still using the theme I launched Godot with

### Minimal reproduction project

N/A
ERR_FAIL_MSG("Cannot perform drop above the root node!");
		}
		to_pos = to_node->get_index();
		to_node = to_node->get_parent();
	} else if (p_type == 1) {
		
		if (to_node == EditorNode::get_singleton()->get_edited_scene()) {
			
			to_pos = 0; 
			return;
		}
		Node *lower_sibling = nullptr;
		if (_has_visible_children(to_node)) {
			to_pos = 0;
		} else {
			for (int i = to_node->get_index() + 1; i < to_node->get_parent()->get_child_count(); i++) {
				Node *c = to_node->get_parent()->get_child(i);
				if (_is_node_visible(c)) {
					lower_sibling = c;
					break;
				}
			}
			if (lower_sibling) {
				to_pos = lower_sibling->get_index();
			}
			to_node = to_node->get_parent();
		}
	}
}
void SceneTreeDock::_files_dropped(Vector<String> p_files, NodePath p_to, int p_type) {