### 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
if (path.begins_with("res:")) {
					path = path.substr(6);
				}
				path = path.get_basename();
				
				scene_name = scene_name.trim_suffix("/");
				path = path.trim_suffix("/");
				
				
				
				can_proceed = can_proceed || (path.size() - scene_name.size()) >= 1;
				E = E->next();
				if (to_erase) {
					iset.erase(to_erase);
				}
			}
			if (!can_proceed) {
				break;
			}
		}
	}
}
void EditorNode::_update_scene_tabs() {
	bool show_rb = EDITOR_GET("interface/scene_tabs/show_script_button");
	if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_GLOBAL_MENU)) {
		DisplayServer::get_singleton()->global_menu_clear("_dock");
	}
	
	Vector<String> disambiguated_scene_names;
	Vector<String> full_path_names;