Desktop: Add support for opening files through the already-running instance via a local socket (#4123)

* Desktop: Forward file-open args from a second launch to the running instance

Also adds socket infrastructure that can be used in the future to allow dispatching actions from another process

* Use socket instead of ipc terminologie

* Fix

* Fix

* Better pipe name on windows

desktop/src/lib.rs

@@ -19,6 +19,7 @@ mod gpu_context;
 mod persist;
 mod preferences;
 mod render;
+mod socket;
 mod window;
 
 pub(crate) mod consts;
@@ -58,7 +59,13 @@ pub fn start() {
 		}
 		Err(_) => {
 			tracing::error!("Another instance is already running, Exiting.");
-			std::process::exit(1);
+			if !cli.files.is_empty()
+				&& let Err(error) = socket::send(socket::Message::OpenFiles(cli.files))
+			{
+				tracing::error!("Failed to send socket message to running instance: {}", error);
+				std::process::exit(1);
+			}
+			return;
 		}
 	};
 
@@ -78,6 +85,8 @@ pub fn start() {
 	let (app_event_sender, app_event_receiver) = std::sync::mpsc::channel();
 	let app_event_scheduler = event_loop.create_app_event_scheduler(app_event_sender);
 
+	let _socket_handle = socket::start(app_event_scheduler.clone());
+
 	let (cef_view_info_sender, cef_view_info_receiver) = std::sync::mpsc::channel();
 
 	if cli.disable_ui_acceleration {