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/term/input.rs

@@ -77,8 +77,8 @@ impl TerminalView {
         }
         drop(term);
         self.pty.write(bytes);
-        if self.records.seen() {
-            self.restate(cx);
+        if self.records.seen() && self.restate(cx) {
+            self.tell_state(cx);
         }
         cx.notify();
     }