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/platform_impl/macos.rs

@@ -80,12 +80,14 @@ fn notify_singleton(socket: &PathBuf) -> Result<(), Error> {
     let mut bf = BufWriter::new(&stream);
     let cwd = std::env::current_dir()
         .unwrap_or_default()
-        .to_str()
-        .unwrap_or_default()
-        .to_string();
+        .to_string_lossy()
+        .into_owned();
     bf.write_all(cwd.as_bytes())?;
     bf.write_all(b"\0\0")?;
-    let args_joined = std::env::args().collect::<Vec<String>>().join("\0");
+    let args_joined = std::env::args_os()
+        .map(|arg| arg.to_string_lossy().into_owned())
+        .collect::<Vec<String>>()
+        .join("\0");
     bf.write_all(args_joined.as_bytes())?;
     bf.flush()?;
     drop(bf);