Better handle cancelled buy orders

freqtrade/freqtradebot.py

@@ -976,6 +976,12 @@ class FreqtradeBot:
             reason = constants.CANCEL_REASON['TIMEOUT']
             corder = self.exchange.cancel_order_with_result(trade.open_order_id, trade.pair,
                                                             trade.amount)
+            # Avoid race condition where the order could not be cancelled coz its already filled.
+            # Simply bailing here is the only safe way - as this order will then be
+            # handled in the next iteration.
+            if corder.get('status') not in ('canceled', 'closed'):
+                logger.warning(f"Order {trade.open_order_id} for {trade.pair} not cancelled.")
+                return False
         else:
             # Order was cancelled already, so we can reuse the existing dict
             corder = order