async sleep

src/imap/idle.rs

@@ -283,7 +283,7 @@ impl Imap {
             // not have entered idle_wait yet, give it some time
             // for that to happen. XXX handle this without extra wait
             // https://github.com/deltachat/deltachat-core-rust/issues/925
-            std::thread::sleep(Duration::from_millis(200));
+            async_std::task::sleep(Duration::from_millis(200)).await;
             info!(context, "low-level: dropping stop-source to interrupt idle");
             std::mem::drop(interrupt)
         }