chore: prevent error exiting when an order is already open and due for cancelation

Author: xmatthias

freqtrade/freqtradebot.py

@@ -1974,7 +1974,11 @@ def _safe_exit_amount(self, trade: Trade, pair: str, amount: float) -> float:
             return amount
 
         trade_base_currency = self.exchange.get_pair_base_currency(pair)
-        wallet_amount = self.wallets.get_free(trade_base_currency)
+        # Free + Used - open orders will eventually still be canceled.
+        wallet_amount = self.wallets.get_free(trade_base_currency) + self.wallets.get_used(
+            trade_base_currency
+        )
+
         logger.debug(f"{pair} - Wallet: {wallet_amount} - Trade-amount: {amount}")
         if wallet_amount >= amount:
             return amount