network: new trigger 'blockchain_updated'

follow-up af63913189
needed to update history tab when new blocks come,
to refresh the number of confirmations (icons/tooltips)

electrum/gui/kivy/main_window.py

@@ -490,7 +490,8 @@ class ElectrumWindow(App):
             activity.bind(on_new_intent=self.on_new_intent)
         # connect callbacks
         if self.network:
-            interests = ['wallet_updated', 'network_updated', 'status', 'new_transaction', 'verified']
+            interests = ['wallet_updated', 'network_updated', 'blockchain_updated',
+                         'status', 'new_transaction', 'verified']
             self.network.register_callback(self.on_network_event, interests)
             self.network.register_callback(self.on_fee, ['fee'])
             self.network.register_callback(self.on_fee_histogram, ['fee_histogram'])
@@ -675,6 +676,9 @@ class ElectrumWindow(App):
         elif event == 'wallet_updated':
             self._trigger_update_wallet()
             self._trigger_update_status()
+        elif event == 'blockchain_updated':
+            # to update number of confirmations in history
+            self._trigger_update_wallet()
         elif event == 'status':
             self._trigger_update_status()
         elif event == 'new_transaction':

electrum/gui/qt/main_window.py

@@ -189,7 +189,8 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
         # network callbacks
         if self.network:
             self.network_signal.connect(self.on_network_qt)
-            interests = ['wallet_updated', 'network_updated', 'new_transaction', 'status',
+            interests = ['wallet_updated', 'network_updated', 'blockchain_updated',
+                         'new_transaction', 'status',
                          'banner', 'verified', 'fee', 'fee_histogram']
             # To avoid leaking references to "self" that prevent the
             # window from being GC-ed when closed, callbacks should be
@@ -304,6 +305,9 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, PrintError):
             self.gui_object.network_updated_signal_obj.network_updated_signal \
                 .emit(event, args)
             self.network_signal.emit('status', None)
+        elif event == 'blockchain_updated':
+            # to update number of confirmations in history
+            self.need_update.set()
         elif event == 'new_transaction':
             wallet, tx = args
             if wallet == self.wallet:

electrum/interface.py

@@ -400,6 +400,7 @@ class Interface(PrintError):
             # in the simple case, height == self.tip+1
             if height <= self.tip:
                 await self.sync_until(height)
+        self.network.trigger_callback('blockchain_updated')
 
     async def sync_until(self, height, next_height=None):
         if next_height is None:

electrum/network.py

@@ -589,7 +589,9 @@ class Network(PrintError):
         i = self.interfaces[server]
         if self.interface != i:
             self.print_error("switching to", server)
+            blockchain_updated = False
             if self.interface is not None:
+                blockchain_updated = i.blockchain != self.interface.blockchain
                 # Stop any current interface in order to terminate subscriptions,
                 # and to cancel tasks in interface.group.
                 # However, for headers sub, give preference to this interface
@@ -605,6 +607,7 @@ class Network(PrintError):
             self.trigger_callback('default_server_changed')
             self.set_status('connected')
             self.trigger_callback('network_updated')
+            if blockchain_updated: self.trigger_callback('blockchain_updated')
 
     @with_interface_lock
     def close_interface(self, interface):