quick frontend (app): call getReady once connected to bridge:

namespaces and encryption plugins are only retrieved once backend is ready, else they may
not yet be available (can happen notably when the backend is start at the same time as the
frontend, e.g. on Android).

sat/plugins/plugin_xep_0329.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# -*- coding: utf-8 -*-
 
 # SAT plugin for File Information Sharing (XEP-0329)
 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)

sat_frontends/quick_frontend/quick_app.py

@@ -349,13 +349,7 @@ class QuickApp(object):
         log.warning(_("Can't retrieve encryption plugins: {msg}").format(msg=failure_))
 
     def onBridgeConnected(self):
-        self.bridge.namespacesGet(
-            callback=self._namespacesGetCb, errback=self._namespacesGetEb)
-        # we cache available encryption plugins, as we'll use them on earch
-        # new chat widget
-        self.bridge.encryptionPluginsGet(
-            callback=self._encryptionPluginsGetCb,
-            errback=self._encryptionPluginsGetEb)
+        self.bridge.getReady(self.onBackendReady)
 
     def _bridgeCb(self):
         self.registerSignal("connected")
@@ -400,6 +394,17 @@ class QuickApp(object):
         else:
             print((_("Error while initialising bridge: {}".format(failure))))
 
+    def onBackendReady(self):
+        log.info("backend is ready")
+        self.bridge.namespacesGet(
+            callback=self._namespacesGetCb, errback=self._namespacesGetEb)
+        # we cache available encryption plugins, as we'll use them on each
+        # new chat widget
+        self.bridge.encryptionPluginsGet(
+            callback=self._encryptionPluginsGetCb,
+            errback=self._encryptionPluginsGetEb)
+
+
     @property
     def current_profile(self):
         """Profile that a user would expect to use"""