linux: Set directory in SaveFileRequest dialog (#13850)

This has been bugging me for a while. If you create a new file and then
save it, the dialogue would show the home directory and not the folder
that you were in.

This fixes it.

Release Notes:

- N/A

crates/gpui/src/platform/linux/platform.rs

@@ -314,10 +314,14 @@ impl<P: LinuxClient + 'static> Platform for P {
         let directory = directory.to_owned();
         self.foreground_executor()
             .spawn(async move {
-                let result = SaveFileRequest::default()
+                let request = SaveFileRequest::default()
                     .modal(true)
                     .title("Select new path")
                     .accept_label("Accept")
+                    .current_folder(directory);
+
+                let result = if let Ok(request) = request {
+                    request
                         .send()
                         .await
                         .ok()
@@ -327,7 +331,10 @@ impl<P: LinuxClient + 'static> Platform for P {
                                 .uris()
                                 .first()
                                 .and_then(|uri| uri.to_file_path().ok())
-                    });
+                        })
+                } else {
+                    None
+                };
 
                 done_tx.send(result);
             })