T40: sessions post system notifications through gpui's: each terminal posts its own in the order its output asks, when its row turns to waiting, done or error, when a command ends, and when a program asks through OSC 9, 777 or 99, only while its window is inactive or it is hidden, one every 3 seconds, titled with the session's name; a press goes to the window whose session posted it and shows it; OSC 99 hears untracked closes, alive lists what lives, in order before a later DA1, a close and w take one back where gpui can, a closed session's too, and the query says what holds where

src/workspace.rs

@@ -192,11 +192,15 @@ impl Workspace {
         if index != self.active
             && let Some(hidden) = self.sessions.get(self.active)
         {
-            hidden.terminal.update(cx, |view, cx| view.let_go(cx));
+            hidden.terminal.update(cx, |view, cx| {
+                view.let_go(cx);
+                view.set_front(false);
+            });
         }
         let session = &mut self.sessions[index];
         session.bell = false;
         session.waiting = false;
+        session.terminal.update(cx, |view, _| view.set_front(true));
         window.focus(&session.terminal.focus_handle(cx), cx);
         let folder = session.folder.clone();
         self.files.update(cx, |files, cx| files.show(&folder, cx));