confirmaion dialog if transaction fee is high

RELEASE-NOTES

@@ -1,3 +1,8 @@
+# Release 1.9.6
+* During wallet creation, do not write seed to disk until it is encrypted.
+* Confirmation dialog if the transaction fee is higher than 1mBTC.
+* bugfixes
+
 # Release 1.9.5
 
 * Coin control: select addresses to send from

gui/qt/main_window.py

@@ -904,6 +904,11 @@ class ElectrumWindow(QMainWindow):
             if not self.question(_("send %(amount)s to %(address)s?")%{ 'amount' : self.format_amount(amount) + ' '+ self.base_unit(), 'address' : to_address}):
                 return
             
+        confirm_fee = self.config.get('confirm_fee', 100000)
+        if fee >= confirm_fee:
+            if not self.question(_("The fee for this transaction seems unusually high.\nAre you really sure you want to pay %(fee)s in fees?")%{ 'fee' : self.format_amount(fee) + ' '+ self.base_unit()}):
+                return
+
         self.send_tx(to_address, amount, fee, label)