notmuch: emit a DirectoryInfo message upon check-mail completion

Send a DirectoryInfo message when check-mail completes to re-fetch
directory content in case it changed.

Signed-off-by: Julian Pidancet <julian.pidancet@oracle.com>
Acked-by: Robin Jarry <robin@jarry.cc>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>

worker/notmuch/worker.go

@@ -702,6 +702,9 @@ func (w *worker) handleCheckMail(msg *types.CheckMail) {
 		if err != nil {
 			w.err(msg, fmt.Errorf("checkmail: error running command: %w", err))
 		} else {
+			w.w.PostMessage(&types.DirectoryInfo{
+				Info: w.getDirectoryInfo(w.currentQueryName, w.query),
+			}, nil)
 			w.done(msg)
 		}
 	}