### 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
renderer->set_tooltip_text(TTR("Choose a renderer."));
	right_menu_hb->add_child(renderer);
	if (can_expand) {
		
		right_menu_spacer = memnew(Control);
		right_menu_spacer->set_mouse_filter(Control::MOUSE_FILTER_PASS);
		menu_hb->add_child(right_menu_spacer);
	}
	String current_renderer = GLOBAL_GET("rendering/renderer/rendering_method");
	PackedStringArray renderers = ProjectSettings::get_singleton()->get_custom_property_info().get(StringName("rendering/renderer/rendering_method")).hint_string.split(",", false);
	
	
	current_renderer = current_renderer.to_lower();
	for (int i = 0; i < renderers.size(); i++) {
		String rendering_method = renderers[i];
		
		if (rendering_method == "forward_plus") {
			renderer->add_item(TTR("Forward+"));
		}
		if (rendering_method == "mobile") {
			renderer->add_item(TTR("Mobile"));
		}
		if (rendering_method == "gl_compatibility") {
			renderer->add_item(TTR("Compatibility"));
		}
		renderer->set_item_metadata(i, rendering_method);
		
		rendering_method = rendering_method.to_lower();
		if (current_renderer == rendering_method) {
			renderer->select(i);