### 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++) {
		Node *node = editor_data.get_edited_scene_root(i);
		if (!node) {
			continue;
		}
		String path = node->get_scene_file_path();
		if (!path.is_empty() && !FileAccess::exists(path)) {
			
			EditorUndoRedoManager::get_singleton()->set_history_as_unsaved(editor_data.get_scene_history_id(i));
		}
	}
	_update_title();
	_update_scene_tabs();
}
void EditorNode::_dialog_action(String p_file) {