network: dedupe qt/qml get_disconnected_server_addrs code

diff --git a/electrum/gui/qml/qeserverlistmodel.py b/electrum/gui/qml/qeserverlistmodel.py
index e781758..b2e2222 100644
--- a/electrum/gui/qml/qeserverlistmodel.py
+++ b/electrum/gui/qml/qeserverlistmodel.py
@@ -111,28 +111,18 @@ class QEServerListModel(QAbstractListModel, QtEventListener):
                 servers.append(server)
 
         # disconnected servers
-        all_servers = self.network.get_servers()
-        connected_hosts = set([iface.host for ifaces in chains.values() for iface in ifaces])
-        protocol = PREFERRED_NETWORK_PROTOCOL
-        for _host, d in sorted(all_servers.items()):
-            if _host in connected_hosts:
-                continue
-            if _host.endswith('.onion') and not self.network.is_proxy_tor:
-                continue
-            port = d.get(protocol)
-            if port:
-                s = ServerAddr(_host, port, protocol=protocol)
-                server = {
-                    'chain': '',
-                    'chain_height': 0,
-                    'height': 0,
-                    'is_primary': False,
-                    'is_connected': False,
-                    'name': s.net_addr_str()
-                }
-                server['address'] = server['name']
-
-                servers.append(server)
+        for s in self.network.get_disconnected_server_addrs():
+            server = {
+                'chain': '',
+                'chain_height': 0,
+                'height': 0,
+                'is_primary': False,
+                'is_connected': False,
+                'name': s.net_addr_str()
+            }
+            server['address'] = server['name']
+
+            servers.append(server)
 
         self.beginInsertRows(QModelIndex(), 0, len(servers) - 1)
         self._servers = servers
diff --git a/electrum/gui/qt/network_dialog.py b/electrum/gui/qt/network_dialog.py
index 4d7c680..2b97064 100644
--- a/electrum/gui/qt/network_dialog.py
+++ b/electrum/gui/qt/network_dialog.py
@@ -149,9 +149,6 @@ class NodesListWidget(QTreeWidget):
     def update(self):
         self.clear()
         network = self.network
-        servers = self.network.get_servers()
-
-        use_tor = bool(network.is_proxy_tor)
 
         # connected servers
         connected_servers_item = QTreeWidgetItem([_("Connected nodes"), ''])
@@ -185,18 +182,7 @@ class NodesListWidget(QTreeWidget):
         # disconnected servers
         disconnected_servers_item = QTreeWidgetItem([_("Other known servers"), ""])
         disconnected_servers_item.setData(0, self.ITEMTYPE_ROLE, self.ItemType.TOPLEVEL)
-        connected_hosts = set([iface.host for ifaces in chains.values() for iface in ifaces])
-        protocol = PREFERRED_NETWORK_PROTOCOL
-        server_addrs = [
-            ServerAddr(_host, port, protocol=protocol)
-            for _host, d in servers.items()
-            if (port := d.get(protocol))]
-        server_addrs.sort(key=lambda x: (-network.is_server_bookmarked(x), str(x)))
-        for server in server_addrs:
-            if server.host in connected_hosts:
-                continue
-            if server.host.endswith('.onion') and not use_tor:
-                continue
+        for server in network.get_disconnected_server_addrs():
             item = QTreeWidgetItem([server.net_addr_str(), ""])
             item.setData(0, self.ITEMTYPE_ROLE, self.ItemType.DISCONNECTED_SERVER)
             item.setData(0, self.SERVER_ADDR_ROLE, server)
diff --git a/electrum/network.py b/electrum/network.py
index 966a31e..2bff22e 100644
--- a/electrum/network.py
+++ b/electrum/network.py
@@ -30,7 +30,7 @@ import threading
 import json
 from typing import (
     NamedTuple, Optional, Sequence, List, Dict, Tuple, TYPE_CHECKING, Iterable, Set, Any, TypeVar,
-    Callable
+    Callable, Mapping,
 )
 import copy
 import functools
@@ -624,7 +624,7 @@ class Network(Logger, NetworkRetryManager[ServerAddr]):
 
 
     @with_recent_servers_lock
-    def get_servers(self):
+    def get_servers(self) -> Mapping[str, Mapping[str, str]]:
         # note: order of sources when adding servers here is crucial!
         # don't let "server_peers" overwrite anything,
         # otherwise main server can eclipse the client
@@ -659,6 +659,25 @@ class Network(Logger, NetworkRetryManager[ServerAddr]):
             out = filter_noonion(out)
         return out
 
+    def get_disconnected_server_addrs(self) -> Sequence[ServerAddr]:
+        servers = self.get_servers()
+        disconnected_server_addrs = []  # type: List[ServerAddr]
+        chains = self.get_blockchains()
+        connected_hosts = set([iface.host for ifaces in chains.values() for iface in ifaces])
+        protocol = PREFERRED_NETWORK_PROTOCOL
+        server_addrs = [
+            ServerAddr(_host, port, protocol=protocol)
+            for _host, d in servers.items()
+            if (port := d.get(protocol))]  # FIXME this filters out even bookmarked servers from other protocols
+        server_addrs.sort(key=lambda x: (-self.is_server_bookmarked(x), str(x)))
+        for server in server_addrs:
+            if server.host in connected_hosts:
+                continue
+            if server.host.endswith('.onion') and not self.is_proxy_tor:
+                continue
+            disconnected_server_addrs.append(server)
+        return disconnected_server_addrs
+
     def _get_next_server_to_try(self) -> Optional[ServerAddr]:
         now = time.time()
         with self.interfaces_lock:
@@ -1122,7 +1141,7 @@ class Network(Logger, NetworkRetryManager[ServerAddr]):
             self._blockchain = interface.blockchain
         return self._blockchain
 
-    def get_blockchains(self):
+    def get_blockchains(self) -> Mapping[str, Sequence[Interface]]:
         out = {}  # blockchain_id -> list(interfaces)
         with blockchain.blockchains_lock: blockchain_items = list(blockchain.blockchains.items())
         with self.interfaces_lock: interfaces_values = list(self.interfaces.values())