fix "max" button to account for 2fa fees in both Qt and kivy

gui/kivy/main_window.py

@@ -694,6 +694,8 @@ class ElectrumWindow(App):
         self.fiat_balance = self.fx.format_amount(c+u+x) + ' [size=22dp]%s[/size]'% self.fx.ccy
 
     def get_max_amount(self):
+        if run_hook('abort_send', self):
+            return ''
         inputs = self.wallet.get_spendable_coins(None, self.electrum_config)
         if not inputs:
             return ''
@@ -705,7 +707,9 @@ class ElectrumWindow(App):
             Clock.schedule_once(lambda dt, bound_e=e: self.show_error(str(bound_e)))
             return ''
         amount = tx.output_value()
-        return format_satoshis_plain(amount, self.decimal_point())
+        __, x_fee_amount = run_hook('get_tx_extra_fee', self.wallet, tx) or (None, 0)
+        amount_after_all_fees = amount - x_fee_amount
+        return format_satoshis_plain(amount_after_all_fees, self.decimal_point())
 
     def format_amount(self, x, is_diff=False, whitespaces=False):
         return format_satoshis(x, 0, self.decimal_point(), is_diff=is_diff, whitespaces=whitespaces)

gui/qt/main_window.py

@@ -1267,6 +1267,8 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         return w
 
     def spend_max(self):
+        if run_hook('abort_send', self):
+            return
         self.is_max = True
         self.do_update_fee()
 
@@ -1364,7 +1366,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
             if self.is_max:
                 amount = tx.output_value()
-                self.amount_e.setAmount(amount)
+                __, x_fee_amount = run_hook('get_tx_extra_fee', self.wallet, tx) or (None, 0)
+                amount_after_all_fees = amount - x_fee_amount
+                self.amount_e.setAmount(amount_after_all_fees)
 
     def from_list_delete(self, item):
         i = self.from_list.indexOfTopLevelItem(item)