add some debugging

src/github.rs

@@ -1859,7 +1859,10 @@ impl Event {
     pub fn comment_from(&self) -> Option<&str> {
         match self {
             Event::Create(_) => None,
-            Event::Issue(e) => Some(&e.changes.as_ref()?.body.as_ref()?.from),
+            Event::Issue(e) => {
+                log::debug!("issue body: {:?}", e.changes);
+                Some(&e.changes.as_ref()?.body.as_ref()?.from)
+            }
             Event::IssueComment(e) => Some(&e.changes.as_ref()?.body.as_ref()?.from),
             Event::Push(_) => None,
         }

src/handlers/assign.rs

@@ -475,16 +475,15 @@ pub(super) async fn handle_command(
                     // r? is ignored if `owners` is not configured in triagebot.toml.
                     return Ok(());
                 }
-                if matches!(
-                    event,
-                    Event::Issue(IssuesEvent {
-                        action: IssuesAction::Opened | IssuesAction::Edited,
-                        ..
-                    })
-                ) {
+                if let Event::Issue(IssuesEvent {
+                    action: action @ (IssuesAction::Opened | IssuesAction::Edited),
+                    ..
+                }) = event
+                {
                     // Don't handle r? comments on new PRs. Those will be
                     // handled by the new PR trigger (which also handles the
                     // welcome message).
+                    log::debug!("not handling PR event {action:?} (delegating to handle_assign)");
                     return Ok(());
                 }
                 if is_self_assign(&name, &event.user().login) {

src/handlers/notification.rs

@@ -57,6 +57,7 @@ pub async fn handle(ctx: &Context, event: &Event) -> anyhow::Result<()> {
     // comment, so they don't get notified again
     let mut users_notified = HashSet::new();
     if let Some(from) = event.comment_from() {
+        log::debug!("previous comment text: {from}");
         for login in parser::get_mentions(from).into_iter() {
             if let Some((Ok(users), _)) = id_from_user(ctx, login).await? {
                 users_notified.extend(users.into_iter().map(|user| user.id.unwrap()));