ffi: remove dc_is_io_running()

It is misleading and should never be checked.

dc_stop_io() also stops pending ephemeral message deletion tasks, so it
should be called in any case before releasing context.

src/chat.rs

@@ -1620,10 +1620,6 @@ pub async fn send_msg_sync(
     chat_id: ChatId,
     msg: &mut Message,
 ) -> Result<MsgId, Error> {
-    if context.is_io_running().await {
-        return send_msg(context, chat_id, msg).await;
-    }
-
     if let Some(mut job) = prepare_send_msg(context, chat_id, msg).await? {
         let mut smtp = crate::smtp::Smtp::new();
 

src/context.rs

@@ -150,7 +150,7 @@ impl Context {
     /// Starts the IO scheduler.
     pub async fn start_io(&self) {
         info!(self, "starting IO");
-        if self.is_io_running().await {
+        if self.inner.is_io_running().await {
             info!(self, "IO is already running");
             return;
         }
@@ -161,11 +161,6 @@ impl Context {
         }
     }
 
-    /// Returns if the IO scheduler is running.
-    pub async fn is_io_running(&self) -> bool {
-        self.inner.is_io_running().await
-    }
-
     /// Stops the IO scheduler.
     pub async fn stop_io(&self) {
         info!(self, "stopping IO");