### Godot version

v4.0.beta15.official [4fa6edc88]

### System information

Windows 11

### Issue description

When drawing a polygon in the editor, several duplicate vertices are added to the polygon array for each click.  In the image below, I clicked three times to draw the triangle, but got 10 entries.  The number you get varies, though I don't know why; I've seen hundreds of points from drawing a hexagon.  I tested it with a Polygon2D, a CollisionPolygon2D, and a CollisionPolygon3D; the issues occurs with all of them.  It later occurred to me that this might happen with a Curve2D as well, and it does.

![image](https://user-images.githubusercontent.com/2808851/214926182-b8609b87-85a1-4a08-8017-be4eeec912c6.png)


### Steps to reproduce

Add a node that has a Polygon or Curve resource, such as a Polygon2D, draw some points, then check the PackedVector2Array resource.

### Minimal reproduction project

N/A
return export_as_menu;
}
void EditorNode::_global_menu_scene(const Variant &p_tag) {
	int idx = (int)p_tag;
	scene_tabs->set_current_tab(idx);
}
void EditorNode::_global_menu_new_window(const Variant &p_tag) {
	if (OS::get_singleton()->get_main_loop()) {
		List<String> args;
		args.push_back("-p");
		OS::get_singleton()->create_instance(args);
	}
}
void EditorNode::_dropped_files(const Vector<String> &p_files) {
	String to_path = ProjectSettings::get_singleton()->globalize_path(FileSystemDock::get_singleton()->get_current_directory());
	_add_dropped_files_recursive(p_files, to_path);
	EditorFileSystem::get_singleton()->scan_changes();
}
void EditorNode::_add_dropped_files_recursive(const Vector<String> &p_files, String to_path) {