### 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)
return access;
}
void EditorFileDialog::_make_dir_confirm() {
	const String stripped_dirname = makedirname->get_text().strip_edges();
	if (dir_access->dir_exists(stripped_dirname)) {
		error_dialog->set_text(TTR("Could not create folder. File with that name already exists."));
		error_dialog->popup_centered(Size2(250, 50) * EDSCALE);
		makedirname->set_text(""); 
		return;
	}
	Error err = dir_access->make_dir(stripped_dirname);
	if (err == OK) {
		dir_access->change_dir(stripped_dirname);
		invalidate();
		update_filters();
		update_dir();
		_push_history();
		if (access != ACCESS_FILESYSTEM) {
			EditorFileSystem::get_singleton()->scan_changes(); 
		}
	} else {
		error_dialog->set_text(TTR("Could not create folder."));
		error_dialog->popup_centered(Size2(250, 50) * EDSCALE);
	}
	makedirname->set_text(""); 
}
void EditorFileDialog::_make_dir() {