### 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
gui_base->add_child(window);
	dock_select_popup->hide();
	_update_dock_containers();
	floating_docks.push_back(dock);
	_edit_current();
}
void EditorNode::_update_dock_containers() {
	for (int i = 0; i < DOCK_SLOT_MAX; i++) {
		if (dock_slot[i]->get_tab_count() == 0 && dock_slot[i]->is_visible()) {
			dock_slot[i]->hide();
		}
		if (dock_slot[i]->get_tab_count() > 0 && !dock_slot[i]->is_visible()) {
			dock_slot[i]->show();
		}
	}
	for (int i = 0; i < vsplits.size(); i++) {
		bool in_use = dock_slot[i * 2 + 0]->get_tab_count() || dock_slot[i * 2 + 1]->get_tab_count();
		if (in_use) {
			vsplits[i]->show();
		} else {
			vsplits[i]->hide();
		}
	}
	if (right_l_vsplit->is_visible() || right_r_vsplit->is_visible()) {
		right_hsplit->show();
	} else {
		right_hsplit->hide();
	}
}
void EditorNode::_dock_select_input(const Ref<InputEvent> &p_input) {