fix(single-instance): forward non-Unicode arguments and cwd (#3644)

* Update windows.rs

* Create single-instance-non-unicode-args.md

* fix on linux and windows too

---------

Co-authored-by: Lucas Nogueira <lucas@tauri.app>

plugins/single-instance/src/lib.rs

@@ -39,8 +39,9 @@ pub(crate) type SingleInstanceCallback<R> =
 /// [`Builder::build`]. Use [`Builder`] directly if you need to set a custom [`Builder::dbus_id`].
 ///
 /// `f` is called with the app handle, the second instance's command line arguments
-/// (as collected by [`std::env::args`], so the first element is the executable path) and its
-/// current working directory. If the `deep-link` feature is enabled, the arguments are first
+/// (as collected by [`std::env::args_os`], so the first element is the executable path) and its
+/// current working directory. Arguments and the working directory that are not valid Unicode
+/// have their invalid parts replaced by U+FFFD. If the `deep-link` feature is enabled, the arguments are first
 /// forwarded to [`tauri-plugin-deep-link`](https://crates.io/crates/tauri-plugin-deep-link)
 /// before `f` runs.
 ///