input: Intercept Enter key when confirming the exit dialog

src/input/mod.rs

@@ -380,6 +380,10 @@ impl State {
                     if dialog.is_open() && pressed && raw == Some(Keysym::Return) {
                         info!("quitting after confirming exit dialog");
                         this.niri.stop_signal.stop();
+
+                        // Don't send this Enter press to any clients.
+                        this.niri.suppressed_keys.insert(key_code);
+                        return FilterResult::Intercept(None);
                     }
                 }