NVDA no longer freezes in some cases when reconnecting to a HumanWare…

… Brailliant BI/B series display via USB.

Fixes #5406.

source/brailleDisplayDrivers/brailliantB.py

@@ -2,7 +2,7 @@
 #A part of NonVisual Desktop Access (NVDA)
 #This file is covered by the GNU General Public License.
 #See the file COPYING for more details.
-#Copyright (C) 2012-2013 NV Access Limited
+#Copyright (C) 2012-2015 NV Access Limited
 
 import os
 import time
@@ -112,6 +112,11 @@ def __init__(self):
 				continue
 			# This will cause the number of cells to be returned.
 			self._sendMessage(MSG_INIT)
+			# #5406: With the new USB driver, the first command is ignored after a reconnection.
+			# Worse, if we don't receive a reply,
+			# _handleResponses freezes for some reason despite the timeout.
+			# Send the init message again just in case.
+			self._sendMessage(MSG_INIT)
 			self._handleResponses(wait=True)
 			if not self.numCells:
 				# HACK: When connected via bluetooth, the display sometimes reports communication not allowed on the first attempt.

user_docs/en/changes.t2t

@@ -34,6 +34,7 @@
 - NVDA now correctly switches to focus mode when tabbing to read-only ARIA grid controls in Browse Mode for Mozilla Firefox and other Gecko-based controls. (#5118)
 - NVDA now correctly reports "no previous" instead of "no next" when there are no more objects when flicking left on a touch screen.
 - Fixed problems when typing multiple words into the filter field in the Input Gestures dialog. (#5426)
+- NVDA no longer freezes in some cases when reconnecting to a HumanWare Brailliant BI/B series display via USB. (#5406)
 
 
 = 2015.3 =