Don't panic if events are lagged

src/update_listener.rs

@@ -7,7 +7,7 @@ use tokio::{
     sync::{broadcast, oneshot},
     task::JoinHandle,
 };
-use tracing::{trace, trace_span};
+use tracing::{trace, trace_span, warn};
 use tracing_futures::Instrument;
 
 struct UpdateListenerTask {
@@ -21,13 +21,17 @@ impl UpdateListenerTask {
         event: Result<SectionEvent, broadcast::RecvError>,
     ) -> eyre::Result<()> {
         let event = match event {
+            Ok(ev) => ev,
             Err(broadcast::RecvError::Closed) => {
                 trace!("section events channel closed");
                 self.running = false;
                 return Ok(());
             }
-            e => e,
-        }?;
+            Err(broadcast::RecvError::Lagged(n)) => {
+                warn!("section events lagged by {}", n);
+                return Ok(());
+            }
+        };
         if let Some((sec_id, state)) = match event {
             SectionEvent::RunStart(_, sec) | SectionEvent::RunUnpause(_, sec) => {
                 Some((sec.id, true))