### 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
Engine::get_singleton()->startup_benchmark_begin_measure("editor_scan_and_import");
	EditorFileSystem::get_singleton()->scan();
}
void EditorNode::set_use_startup_benchmark(bool p_use_startup_benchmark, const String &p_startup_benchmark_file) {
	use_startup_benchmark = p_use_startup_benchmark;
	startup_benchmark_file = p_startup_benchmark_file;
}
Error EditorNode::export_preset(const String &p_preset, const String &p_path, bool p_debug, bool p_pack_only) {
	export_defer.preset = p_preset;
	export_defer.path = p_path;
	export_defer.debug = p_debug;
	export_defer.pack_only = p_pack_only;
	cmdline_export_mode = true;
	return OK;
}
void EditorNode::show_accept(const String &p_text, const String &p_title) {
	current_menu_option = -1;
	accept->set_ok_button_text(p_title);
	accept->set_text(p_text);
	accept->popup_centered();
}
void EditorNode::show_save_accept(const String &p_text, const String &p_title) {
	current_menu_option = -1;
	save_accept->set_ok_button_text(p_title);
	save_accept->set_text(p_text);
	save_accept->popup_centered();
}
void EditorNode::show_warning(const String &p_text, const String &p_title) {