### 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
case FILE_SAVE_SCENE:
		case FILE_SAVE_AS_SCENE: {
			int scene_idx = (current_menu_option == FILE_SAVE_SCENE || current_menu_option == FILE_SAVE_AS_SCENE) ? -1 : tab_closing_idx;
			if (file->get_file_mode() == EditorFileDialog::FILE_MODE_SAVE_FILE) {
				bool same_open_scene = false;
				for (int i = 0; i < editor_data.get_edited_scene_count(); i++) {
					if (editor_data.get_scene_path(i) == p_file && i != scene_idx) {
						same_open_scene = true;
					}
				}
				if (same_open_scene) {
					show_warning(TTR("Can't overwrite scene that is still open!"));
					return;
				}
				_save_default_environment();
				_save_scene_with_preview(p_file, scene_idx);
				_add_to_recent_scenes(p_file);
				save_layout();
				if (scene_idx != -1) {
					_discard_changes();
				}
			}
		} break;
		case FILE_SAVE_AND_RUN: {
			if (file->get_file_mode() == EditorFileDialog::FILE_MODE_SAVE_FILE) {
				_save_default_environment();
				_save_scene_with_preview(p_file);
				_run(false, p_file);
			}
		} break;