feat(network): add “Reset known servers” action in Qt and QML

electrum/gui/qml/components/NetworkOverview.qml

@@ -297,6 +297,35 @@ Pane {
                 }
             }
 
+            FlatButton {
+                Layout.fillWidth: true
+                Layout.preferredWidth: 1
+                text: qsTr('Reset known servers');
+                icon.source: '../../icons/network.png'
+                onClicked: {
+                    var dialog = app.messageDialog.createObject(app, {
+                        title: qsTr('Are you sure?'),
+                        text: qsTr('This will remove cached recently connected servers.'),
+                        yesno: true
+                    })
+                    dialog.accepted.connect(function() {
+                        var removed = Network.clearKnownServers()
+                        Network.serverListModel.initModel()
+                        var msg = removed < 0
+                            ? qsTr('Failed to reset known servers.')
+                            : removed > 0
+                                ? qsTr('%1 known servers were removed.').arg(removed)
+                                : qsTr('No cached known servers were found.')
+                        var infoDialog = app.messageDialog.createObject(app, {
+                            title: qsTr('Reset known servers'),
+                            text: msg
+                        })
+                        infoDialog.open()
+                    })
+                    dialog.open()
+                }
+            }
+
             FlatButton {
                 Layout.fillWidth: true
                 Layout.preferredWidth: 1

electrum/gui/qml/qenetwork.py

@@ -314,3 +314,11 @@ class QENetwork(QObject, QtEventListener):
         except Exception:
             self._logger.exception("failed to clear pinned server certificates")
             return -1
+
+    @pyqtSlot(result=int)
+    def clearKnownServers(self):
+        try:
+            return self.network.run_from_another_thread(self.network.clear_recent_servers())
+        except Exception:
+            self._logger.exception("failed to clear known servers")
+            return -1

electrum/gui/qt/network_dialog.py

@@ -446,8 +446,11 @@ class ServerWidget(QWidget, QtEventListener):
 
         self.clear_certs_button = QPushButton(_('Reset SSL certificates'))
         self.clear_certs_button.clicked.connect(self.clear_pinned_server_certs)
+        self.clear_known_servers_button = QPushButton(_('Reset known servers'))
+        self.clear_known_servers_button.clicked.connect(self.clear_known_servers)
         buttons = QHBoxLayout()
         buttons.addStretch(1)
+        buttons.addWidget(self.clear_known_servers_button)
         buttons.addWidget(self.clear_certs_button)
         self.layout().addLayout(buttons)
 
@@ -615,6 +618,31 @@ class ServerWidget(QWidget, QtEventListener):
             msg = _('No cached certificate files were found.')
         QMessageBox.information(self, _('Reset SSL certificates'), msg)
 
+    def clear_known_servers(self):
+        result = QMessageBox.question(
+            self,
+            _('Reset known servers'),
+            _('This will remove cached recently connected servers.')
+            + '\n\n'
+            + _('Do you want to continue?'),
+            QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No,
+            QMessageBox.StandardButton.No,
+        )
+        if result != QMessageBox.StandardButton.Yes:
+            return
+        try:
+            removed = self.network.run_from_another_thread(self.network.clear_recent_servers())
+        except Exception as e:
+            _logger.exception("failed to clear known servers")
+            QMessageBox.critical(self, _('Reset known servers'), str(e))
+            return
+        if removed > 0:
+            msg = _('{} known servers were removed.').format(removed)
+        else:
+            msg = _('No cached known servers were found.')
+        self.nodes_list_widget.update()
+        QMessageBox.information(self, _('Reset known servers'), msg)
+
 
 class NostrWidget(QWidget, QtEventListener):
 

electrum/network.py

@@ -429,6 +429,16 @@ class Network(Logger, NetworkRetryManager[ServerAddr]):
                 await self._close_interface(iface)
         return removed
 
+    async def clear_recent_servers(self) -> int:
+        """Delete cached list of recently connected servers."""
+        with self.recent_servers_lock:
+            removed = len(self._recent_servers)
+            self._recent_servers = []
+            self._save_recent_servers()
+        self.logger.info(f"removed {removed} cached recent server(s)")
+        util.trigger_callback('network_updated')
+        return removed
+
     def has_channel_db(self):
         return self.channel_db is not None