fixes for hardware wallets

lib/plugins.py

@@ -356,7 +356,6 @@ class DeviceMgr(ThreadJob, PrintError):
             _id = self.xpub_ids.pop(xpub)
             client = self.client_lookup(_id)
             self.clients.pop(client, None)
-        #wallet.unpaired()
         if client:
             client.close()
 
@@ -369,7 +368,6 @@ class DeviceMgr(ThreadJob, PrintError):
     def pair_xpub(self, xpub, id_):
         with self.lock:
             self.xpub_ids[xpub] = id_
-        #wallet.paired()
 
     def client_lookup(self, id_):
         with self.lock:
@@ -407,7 +405,8 @@ class DeviceMgr(ThreadJob, PrintError):
     def force_pair_xpub(self, plugin, handler, xpub, derivation, devices):
         # The wallet has not been previously paired, so let the user
         # choose an unpaired device and compare its first address.
-        info = self.select_device(handler, plugin, devices)
+        with self.lock:
+            info = self.select_device(handler, plugin, devices)
         client = self.client_lookup(info.device.id_)
         if client and client.is_pairable():
             # See comment above for same code