fix: Restart i/o when there are new transports in a sync message (#7640)

src/transport.rs

@@ -9,6 +9,7 @@
 //! and configured list of connection candidates.
 
 use std::fmt;
+use std::pin::Pin;
 
 use anyhow::{Context as _, Result, bail, format_err};
 use deltachat_contact_tools::{EmailAddress, addr_normalize};
@@ -760,11 +761,18 @@ pub(crate) async fn sync_transports(
         .await?;
 
     if modified {
+        tokio::task::spawn(restart_io_if_running_boxed(context.clone()));
         context.emit_event(EventType::TransportsModified);
     }
     Ok(())
 }
 
+/// Same as `context.restart_io_if_running()`, but `Box::pin`ed and with a `+ Send` bound,
+/// so that it can be called recursively.
+fn restart_io_if_running_boxed(context: Context) -> Pin<Box<dyn Future<Output = ()> + Send>> {
+    Box::pin(async move { context.restart_io_if_running().await })
+}
+
 /// Adds transport entry to the `transports` table with empty configuration.
 pub(crate) async fn add_pseudo_transport(context: &Context, addr: &str) -> Result<()> {
     context.sql