disable mempool fee use, remove from RELEASE-NOTES

gui/kivy/uix/dialogs/fee_dialog.py

@@ -24,7 +24,7 @@ Builder.load_string('''
                 background_color: (0,0,0,0)
                 bold: True
                 on_release:
-                    root.method  = (root.method + 1) % 3
+                    root.method  = (root.method + 1) % 2
                     root.update_slider()
                     root.update_text()
         BoxLayout:
@@ -117,7 +117,7 @@ class FeeDialog(Factory.Popup):
         value = int(self.ids.slider.value)
         dynfees, mempool = self.get_method()
         self.config.set_key('dynamic_fees', dynfees, False)
-        self.config.set_key('mempool_fees', mempool, False)
+        self.config.set_key('mempool_fees', False, False)
         if dynfees:
             if mempool:
                 self.config.set_key('depth_level', value, True)

gui/qt/main_window.py

@@ -2639,15 +2639,14 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
 
         msg = '\n'.join([
             _('Time based: fee rate is based on average confirmation time estimates'),
-            _('Mempool based: fee rate is targeting a depth in the memory pool')
             ]
         )
         fee_type_label = HelpLabel(_('Fee estimation') + ':', msg)
         fee_type_combo = QComboBox()
-        fee_type_combo.addItems([_('Static'), _('ETA'), _('Mempool')])
+        fee_type_combo.addItems([_('Static'), _('ETA')])
         fee_type_combo.setCurrentIndex((2 if self.config.use_mempool_fees() else 1) if self.config.is_dynfee() else 0)
         def on_fee_type(x):
-            self.config.set_key('mempool_fees', x==2)
+            self.config.set_key('mempool_fees', False)
             self.config.set_key('dynamic_fees', x>0)
             self.fee_slider.update()
         fee_type_combo.currentIndexChanged.connect(on_fee_type)

lib/simple_config.py

@@ -437,7 +437,7 @@ class SimpleConfig(PrintError):
         return bool(self.get('dynamic_fees', True))
 
     def use_mempool_fees(self):
-        return bool(self.get('mempool_fees', False))
+        return False
 
     def fee_per_kb(self, dyn=None, mempool=None):
         """Returns sat/kvB fee to pay for a txn.