### Godot version

4.1.1

### System information

linux

### Issue description

- When favoriting a path in a `FileDialog`, clicking on it travels to `path/to/dir/`.
- When going up a level from there, it doesn't go to `path/to` but to `path/to/dir` (without the `/`).

[simplescreenrecorder-2023-08-18_09.38.37.webm](https://github.com/godotengine/godot/assets/71937306/00c20ad3-292f-4961-84ed-dbc64906df52)

The problem is either (or both) that:
 - loaded path has a trailing `/`
 - parent dir of `stuff/` is considered to be `stuff`

### Steps to reproduce

favorite a directory and use the feature to navigate to it

### Minimal reproduction project

any (i.e. the project manager's "new project" dialog has one)
}
		if (match) {
			item_list->add_item(files.front()->get());
			if (get_icon_func) {
				Ref<Texture2D> icon = get_icon_func(cdir.path_join(files.front()->get()));
				if (display_mode == DISPLAY_THUMBNAILS) {
					Ref<Texture2D> thumbnail;
					if (get_thumbnail_func) {
						thumbnail = get_thumbnail_func(cdir.path_join(files.front()->get()));
					}
					if (thumbnail.is_null()) {
						thumbnail = file_thumbnail;
					}
					item_list->set_item_icon(-1, thumbnail);
					item_list->set_item_tag_icon(-1, icon);
				} else {
					item_list->set_item_icon(-1, icon);
				}
			}
			Dictionary d;
			d["name"] = files.front()->get();
			d["dir"] = false;
			String fullpath = cdir.path_join(files.front()->get());
			d["path"] = fullpath;
			item_list->set_item_metadata(-1, d);
			if (display_mode == DISPLAY_THUMBNAILS && previews_enabled) {
				EditorResourcePreview::get_singleton()->queue_resource_preview(fullpath, this, "_thumbnail_result", fullpath);
			}
			if (file->get_text() == files.front()->get()) {
				item_list->set_current(item_list->get_item_count() - 1);