### 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
prev_scene->set_flat(true);
	prev_scene->set_icon(gui_base->get_theme_icon(SNAME("PrevScene"), SNAME("EditorIcons")));
	prev_scene->set_tooltip_text(TTR("Go to previously opened scene."));
	prev_scene->set_disabled(true);
	prev_scene->connect("pressed", callable_mp(this, &EditorNode::_menu_option).bind(FILE_OPEN_PREV));
	gui_base->add_child(prev_scene);
	prev_scene->set_position(Point2(3, 24));
	prev_scene->hide();
	accept = memnew(AcceptDialog);
	gui_base->add_child(accept);
	accept->connect("confirmed", callable_mp(this, &EditorNode::_menu_confirm_current));
	save_accept = memnew(AcceptDialog);
	gui_base->add_child(save_accept);
	save_accept->connect("confirmed", callable_mp(this, &EditorNode::_menu_option).bind((int)MenuOptions::FILE_SAVE_AS_SCENE));
	project_export = memnew(ProjectExportDialog);
	gui_base->add_child(project_export);
	dependency_error = memnew(DependencyErrorDialog);
	gui_base->add_child(dependency_error);
	dependency_fixer = memnew(DependencyEditor);
	gui_base->add_child(dependency_fixer);
	editor_settings_dialog = memnew(EditorSettingsDialog);
	gui_base->add_child(editor_settings_dialog);
	project_settings_editor = memnew(ProjectSettingsEditor(&editor_data));
	gui_base->add_child(project_settings_editor);
	scene_import_settings = memnew(SceneImportSettings);
	gui_base->add_child(scene_import_settings);
	audio_stream_import_settings = memnew(AudioStreamImportSettings);
	gui_base->add_child(audio_stream_import_settings);
	fontdata_import_settings = memnew(DynamicFontImportSettings);
	gui_base->add_child(fontdata_import_settings);