Prevent exceptions in NetworkManager::createRequest.

qutebrowser/network/networkmanager.py

@@ -30,7 +30,7 @@ else:
     SSL_AVAILABLE = QSslSocket.supportsSsl()
 
 from qutebrowser.config import config
-from qutebrowser.utils import message, log, usertypes
+from qutebrowser.utils import message, log, usertypes, utils
 from qutebrowser.network import qutescheme, schemehandler
 
 
@@ -113,6 +113,13 @@ class NetworkManager(QNetworkAccessManager):
             authenticator.realm()), mode=usertypes.PromptMode.user_pwd)
         self._fill_authenticator(authenticator, answer)
 
+    # WORKAROUND for:
+    # http://www.riverbankcomputing.com/pipermail/pyqt/2014-September/034806.html
+    #
+    # By returning False, we provoke a TypeError because of a wrong return
+    # type, which does *not* trigger a segfault but invoke our return handler
+    # immediately.
+    @utils.prevent_exceptions(False)
     def createRequest(self, op, req, outgoing_data):
         """Return a new QNetworkReply object.