### 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
for (int i = 0; i < editor_data.get_edited_scene_count(); i++) {
		disambiguated_scene_names.append(editor_data.get_scene_title(i));
		full_path_names.append(editor_data.get_scene_path(i));
	}
	disambiguate_filenames(full_path_names, disambiguated_scene_names);
	
	scene_tabs->disconnect("tab_changed", callable_mp(this, &EditorNode::_scene_tab_changed));
	scene_tabs->clear_tabs();
	Ref<Texture2D> script_icon = gui_base->get_theme_icon(SNAME("Script"), SNAME("EditorIcons"));
	for (int i = 0; i < editor_data.get_edited_scene_count(); i++) {
		Node *type_node = editor_data.get_edited_scene_root(i);
		Ref<Texture2D> icon;
		if (type_node) {
			icon = EditorNode::get_singleton()->get_object_icon(type_node, "Node");
		}
		bool unsaved = EditorUndoRedoManager::get_singleton()->is_history_unsaved(editor_data.get_scene_history_id(i));
		scene_tabs->add_tab(disambiguated_scene_names[i] + (unsaved ? "(*)" : ""), icon);
		if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_GLOBAL_MENU)) {
			DisplayServer::get_singleton()->global_menu_add_item("_dock", editor_data.get_scene_title(i) + (unsaved ? "(*)" : ""), callable_mp(this, &EditorNode::_global_menu_scene), Callable(), i);
		}
		if (show_rb && editor_data.get_scene_root_script(i).is_valid()) {
			scene_tabs->set_tab_button_icon(i, script_icon);
		}
	}
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_GLOBAL_MENU)) {
		DisplayServer::get_singleton()->global_menu_add_separator("_dock");
		DisplayServer::get_singleton()->global_menu_add_item("_dock", TTR("New Window"), callable_mp(this, &EditorNode::_global_menu_new_window));
	}
	if (scene_tabs->get_tab_count() > 0) {
		scene_tabs->set_current_tab(editor_data.get_edited_scene());