### 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
file_export_lib_merge->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
	file_export_lib_merge->set_pressed(true);
	file_export_lib->get_vbox()->add_child(file_export_lib_merge);
	file_export_lib_apply_xforms = memnew(CheckBox);
	file_export_lib_apply_xforms->set_text(TTR("Apply MeshInstance Transforms"));
	file_export_lib_apply_xforms->set_h_size_flags(Control::SIZE_SHRINK_CENTER);
	file_export_lib_apply_xforms->set_pressed(false);
	file_export_lib->get_vbox()->add_child(file_export_lib_apply_xforms);
	gui_base->add_child(file_export_lib);
	file_script = memnew(EditorFileDialog);
	file_script->set_title(TTR("Open & Run a Script"));
	file_script->set_access(EditorFileDialog::ACCESS_FILESYSTEM);
	file_script->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
	List<String> sexts;
	ResourceLoader::get_recognized_extensions_for_type("Script", &sexts);
	for (const String &E : sexts) {
		file_script->add_filter("*." + E);
	}
	gui_base->add_child(file_script);
	file_script->connect("file_selected", callable_mp(this, &EditorNode::_dialog_action));
	file_menu->connect("id_pressed", callable_mp(this, &EditorNode::_menu_option));
	file_menu->connect("about_to_popup", callable_mp(this, &EditorNode::_update_file_menu_opened));
	file_menu->connect("popup_hide", callable_mp(this, &EditorNode::_update_file_menu_closed));
	settings_menu->connect("id_pressed", callable_mp(this, &EditorNode::_menu_option));
	file->connect("file_selected", callable_mp(this, &EditorNode::_dialog_action));
	file_templates->connect("file_selected", callable_mp(this, &EditorNode::_dialog_action));
	audio_preview_gen = memnew(AudioStreamPreviewGenerator);
	add_child(audio_preview_gen);
	add_editor_plugin(memnew(DebuggerEditorPlugin(debug_menu)));
	disk_changed = memnew(ConfirmationDialog);