Make NVDA sleep while a secure desktop is active. Among other things,…

… this prevents scripts from executing, which is a security risk; e.g. commands bound to a braille display.

Fixes #2449.

source/IAccessibleHandler.py

@@ -673,6 +673,11 @@ def _get_name(self):
 	def _get_role(self):
 		return controlTypes.ROLE_PANE
 
+	def event_gainFocus(self):
+		super(SecureDesktopNVDAObject, self).event_gainFocus()
+		# After handling the focus, NVDA should sleep while the secure desktop is active.
+		self.sleepMode = True
+
 def processDesktopSwitchWinEvent(window,objectID,childID):
 	hDesk=windll.user32.OpenInputDesktop(0, False, 0)
 	if hDesk!=0:

user_docs/en/changes.t2t

@@ -43,6 +43,7 @@
 - When installing an add-on, the confirmation dialog now correctly shows the localised name of the add-on if available. (#2422)
 - In applications using UI Automation (such as .net and Silverlight applications), the calculation of numeric values for controls such as sliders has been corrected. (#2417)
 - The configuration for reporting of progress bars is now honoured for the indeterminate progress bars displayed by NVDA when installing, creating a portable copy, etc. (#2574)
+- NVDA commands can no longer be executed from a braille display while a secure Windows screen (such as the Lock screen) is active. (#2449)
 
 
 == Changes for Developers ==