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Nvda utters unavailable after copying files #6842

@fernando-jose-silva

Description

@fernando-jose-silva

Soon after finishing copying several files using windows explorer, nvda announces unavailable and does not inform the item focused on windows explorer.
To do the tests.
Using windows 10 build 14393 64 bits, for this tests I used the nvda master 13865, this acarn with previous versions of nvda.
Open the Start menu and the "This computer" item.
Enter a folder and paste ctrl + v a large amount of files, in this case paste a folder of a portable nvda that has about 3gb for the amount of you that was saved in it.
Shortly after the copying of the files, nvda says "unavailable, 100%" is muted.
The expected one would be that nvda will report "100% and the item with focus on the list of files and folders of windows explorer".
This error does not occur with the copy of all the files, it is an intemitente error, today it has already occurred with the copy of the nvda executable and of this folder of files, but it did not happen with the copy of files of complements of nvda and files .doc .
Follow the log:

IO - speech.speak (10:32:51):
Speaking [u'indispon\xedvel']
IO - speech.speak (10:32:51):
Speaking [u'100 porcento']
IO - inputCore.InputManager.executeGesture (10:33:17):
Input: kb(laptop):NVDA+f1
INFO - globalCommands.GlobalCommands.script_navigatorObject_devInfo (10:33:17):
Developer info for navigator object:
name: ''
role: ROLE_CHECKBOX
states: exception: (-2147220991, 'Um evento n\xe3o p\xf4de chamar assinantes', (None, None, None, 0, None))
isFocusable: exception: (-2147220991, 'Um evento n\xe3o p\xf4de chamar assinantes', (None, None, None, 0, None))
hasFocus: False
Python object: <NVDAObjects.UIA.UIA object at 0x0AD039D0>
Python class mro: (<class 'NVDAObjects.UIA.UIA'>, <class 'NVDAObjects.window.Window'>, <class 'NVDAObjects.NVDAObject'>, <class 'baseObject.ScriptableObject'>, <class 'baseObject.AutoPropertyObject'>, <type 'object'>)
description: ''
location: None
value: None
appModule: <'explorer' (appName u'explorer', process ID 47340) at address 5364090>
appModule.productName: u'Sistema operacional Microsoft\xae Windows\xae'
appModule.productVersion: u'10.0.14393.0'
TextInfo: <class 'NVDAObjects.NVDAObjectTextInfo'>
windowHandle: 786686
windowClassName: u'DirectUIHWND'
windowControlID: 0
windowStyle: 1442840576
windowThreadID: 49868
windowText: u''
displayText: exception: 'NoneType' object is not iterable
UIAElement: <POINTER(IUIAutomationElement) ptr=0x7967018 at ac9ee90>
UIA automationID: Exception: (-2147220991, 'Um evento n\xe3o p\xf4de chamar assinantes', (None, None, None, 0, None))
UIA frameworkID: DirectUI
UIA runtimeID: (47340, 287165744, 0)
UIA providerDescription: [pid:47340,hwnd:0x0 Main(parent link):Unidentified Provider (unmanaged:DUI70.dll)]
UIA className: Exception: (-2147220991, 'Um evento n\xe3o p\xf4de chamar assinantes', (None, None, None, 0, None))

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    close/works-for-mep3https://github.com/nvaccess/nvda/blob/master/projectDocs/issues/triage.md#priorityquick fix

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