prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  nvda does not automatically read messages received on skype for business
  
  ### Steps to reproduce:
  I'm sure I've seen this working for some time.
  I have not used skype for business for a long time but in my current work I'm making use of it again, and when I received a message on skype for business, nvda did not automatically read the received message.
  Open a conversation on skype for business type something and wait inside the conversation for your partner to respond.
  ### Actual behavior:
  The nvda is mute.
  ### Expected behavior:
  Nvda should automatically announce the response received.
  ### System configuration
  #### NVDA installed/portable/running from source:
  install
  #### NVDA version:
  2018.4.1
  #### Windows version:
  10 17134.556
  #### Name and version of other software in use when reproducing the issue:
  office 16.0.4266.1001
  
  #### Other information about your system:
  
  ### Other questions
  #### Does the issue still occur after restarting your PC?
  yes
  #### Have you tried any other versions of NVDA?
  no
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `source/appModules/lync.py`
  Content:
  ```
  1 #A part of NonVisual Desktop Access (NVDA)
  2 #This file is covered by the GNU General Public License.
  3 #See the file COPYING for more details.
  4 #Copyright (C) 2017 NV Access Limited
  5 
  6 """appModule for Microsoft Skype for business. """
  7  
  8 import ui
  9 from NVDAObjects.UIA import UIA
  10 import appModuleHandler
  11 
  12 class NetUIRicherLabel(UIA):
  13 	"""A label sometimes found within list items that can fire live region changes, such as for chat messages."""
  14 
  15 	def event_liveRegionChange(self):
  16 		# The base liveRegionChange event is not enough as Skype for Business concatinates recent chat messages from the same person within the same minute
  17 		# Therefore, specifically strip out the chat content and only report the most recent part added.
  18 		# The object's name contains the full message (I.e. person: content, timestamp) loosely separated by commas.
  19 		# Example string: "Michael Curran : , , Hello\r\n\r\nThis is a test , 10:45 am."
  20 		# Where person is "Michael Curran", content is "Hello\nThis is a test" and timestamp is "10:45 am" 
  21 		# The object's value just contains the content.
  22 		# Example: "Hello\rThis is a test"
  23 		# We are only interested in person and content
  24 		# Therefore use value (content) to  locate and split off the person from the name (fullText)
  25 		# Normalize the usage of end-of-line characters (name and value seem to expose them differently, which would break comparison)
  26 		content=self.value.replace('\r','\n').strip()
  27 		fullText=self.name.replace('\r\n\r\n','\n')
  28 		contentLines=content.split('\n')
  29 		contentStartIndex=fullText.find(content)
  30 		pretext=fullText[:contentStartIndex]
  31 		# There are some annoying comma characters  after the person's name 
  32 		pretext=pretext.replace(' ,','')
  33 		# If the objects are the same, the person is the same, and the new content is the old content but with more appended, report the appended content
  34 		# Otherwise, report the person and the initial content
  35 		runtimeID=self.UIAElement.getRuntimeId()
  36 		lastRuntimeID,lastPretext,lastContentLines=self.appModule._lastLiveChatMessageData
  37 		contentLinesLen=len(contentLines)
  38 		lastContentLinesLen=len(lastContentLines)
  39 		if runtimeID==lastRuntimeID and pretext==lastPretext and contentLinesLen>lastContentLinesLen and contentLines[:lastContentLinesLen]==lastContentLines:
  40 			message="\n".join(contentLines[lastContentLinesLen:])
  41 		else:
  42 			message=pretext+content
  43 		ui.message(message)
  44 		# Cache the message data for later possible comparisons 
  45 		self.appModule._lastLiveChatMessageData=runtimeID,pretext,contentLines
  46 
  47 class AppModule(appModuleHandler.AppModule):
  48 
  49 	# data to store the last chat message (runtime ID,person,content lines)
  50 	_lastLiveChatMessageData=[],"",[]
  51 
  52 	def chooseNVDAObjectOverlayClasses(self,obj,clsList):
  53 		if isinstance(obj,UIA) and obj.UIAElement.cachedClassName=='NetUIRicherLabel':
  54 			clsList.insert(0,NetUIRicherLabel)
  55 		return clsList
  56 
  57
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/source/appModules/lync.py b/source/appModules/lync.py
  --- a/source/appModules/lync.py
  +++ b/source/appModules/lync.py
  @@ -4,10 +4,14 @@
   #Copyright (C) 2017 NV Access Limited
   
   """appModule for Microsoft Skype for business. """
  - 
  +
   import ui
   from NVDAObjects.UIA import UIA
   import appModuleHandler
  +from logHandler import log
  +
  +import re
  +
   
   class NetUIRicherLabel(UIA):
   	"""A label sometimes found within list items that can fire live region changes, such as for chat messages."""
  @@ -15,19 +19,45 @@
   	def event_liveRegionChange(self):
   		# The base liveRegionChange event is not enough as Skype for Business concatinates recent chat messages from the same person within the same minute
   		# Therefore, specifically strip out the chat content and only report the most recent part added.
  -		# The object's name contains the full message (I.e. person: content, timestamp) loosely separated by commas.
  +		# When not empty, the object's name contains the full message (I.e. person: content, timestamp)
  +		# loosely separated by commas.
   		# Example string: "Michael Curran : , , Hello\r\n\r\nThis is a test , 10:45 am."
   		# Where person is "Michael Curran", content is "Hello\nThis is a test" and timestamp is "10:45 am" 
  -		# The object's value just contains the content.
  -		# Example: "Hello\rThis is a test"
  -		# We are only interested in person and content
  -		# Therefore use value (content) to  locate and split off the person from the name (fullText)
  +		
   		# Normalize the usage of end-of-line characters (name and value seem to expose them differently, which would break comparison)
  -		content=self.value.replace('\r','\n').strip()
   		fullText=self.name.replace('\r\n\r\n','\n')
  +		
  +		# At the object's creation, an unuseful liveRegionChange event is triggered with an empty name,
  +		# so we discard it.
  +		if not self.name.strip():
  +			return
  +		
  +		if self.value is not None:
  +			# For some versions of Lync / Skype for Business, the object's value contains just the content.
  +			# Example: "Hello\rThis is a test"
  +			# We are only interested in person and content
  +			# Therefore use value (content) to  locate and split off the person from the name (fullText)
  +			content = self.value.replace('\r', '\n').strip()
  +			contentStartIndex = fullText.find(content)
  +			pretext = fullText[:contentStartIndex]
  +		else:
  +			# For other versions of Lync / Skype for Business, self.value is just None.
  +			# So we just look at self.name formatting to split content from person and timestamp (less robust).
  +			pattern = r'^(?P<name>.+?): (?P<priority>.*?), , (?P<content>.+),(?!, , ) , (?P<timestamp>.+)'
  +			match = re.match(pattern, self.name, flags=re.DOTALL)
  +			if match:
  +				pretext = match['name']
  +				priority = match['priority']
  +				content = match['content']
  +				if priority:
  +					content = priority + ', ' + content
  +			else:
  +				# In case no match is found, log the unexpected message and return the whole message.
  +				log.error(f'Unrecognized pattern in the following message: {self.name}')
  +				pretext = ''
  +				content = self.name
  +			content = content.replace('\r', '\n').strip()
   		contentLines=content.split('\n')
  -		contentStartIndex=fullText.find(content)
  -		pretext=fullText[:contentStartIndex]
   		# There are some annoying comma characters  after the person's name 
   		pretext=pretext.replace(' ,','')
   		# If the objects are the same, the person is the same, and the new content is the old content but with more appended, report the appended content
  
verification_info: {"golden_diff": "diff --git a/source/appModules/lync.py b/source/appModules/lync.py\n--- a/source/appModules/lync.py\n+++ b/source/appModules/lync.py\n@@ -4,10 +4,14 @@\n #Copyright (C) 2017 NV Access Limited\r\n \r\n \"\"\"appModule for Microsoft Skype for business. \"\"\"\r\n- \r\n+\r\n import ui\r\n from NVDAObjects.UIA import UIA\r\n import appModuleHandler\r\n+from logHandler import log\r\n+\r\n+import re\r\n+\r\n \r\n class NetUIRicherLabel(UIA):\r\n \t\"\"\"A label sometimes found within list items that can fire live region changes, such as for chat messages.\"\"\"\r\n@@ -15,19 +19,45 @@\n \tdef event_liveRegionChange(self):\r\n \t\t# The base liveRegionChange event is not enough as Skype for Business concatinates recent chat messages from the same person within the same minute\r\n \t\t# Therefore, specifically strip out the chat content and only report the most recent part added.\r\n-\t\t# The object's name contains the full message (I.e. person: content, timestamp) loosely separated by commas.\r\n+\t\t# When not empty, the object's name contains the full message (I.e. person: content, timestamp)\r\n+\t\t# loosely separated by commas.\r\n \t\t# Example string: \"Michael Curran : , , Hello\\r\\n\\r\\nThis is a test , 10:45 am.\"\r\n \t\t# Where person is \"Michael Curran\", content is \"Hello\\nThis is a test\" and timestamp is \"10:45 am\" \r\n-\t\t# The object's value just contains the content.\r\n-\t\t# Example: \"Hello\\rThis is a test\"\r\n-\t\t# We are only interested in person and content\r\n-\t\t# Therefore use value (content) to  locate and split off the person from the name (fullText)\r\n+\t\t\r\n \t\t# Normalize the usage of end-of-line characters (name and value seem to expose them differently, which would break comparison)\r\n-\t\tcontent=self.value.replace('\\r','\\n').strip()\r\n \t\tfullText=self.name.replace('\\r\\n\\r\\n','\\n')\r\n+\t\t\r\n+\t\t# At the object's creation, an unuseful liveRegionChange event is triggered with an empty name,\r\n+\t\t# so we discard it.\r\n+\t\tif not self.name.strip():\r\n+\t\t\treturn\r\n+\t\t\r\n+\t\tif self.value is not None:\r\n+\t\t\t# For some versions of Lync / Skype for Business, the object's value contains just the content.\r\n+\t\t\t# Example: \"Hello\\rThis is a test\"\r\n+\t\t\t# We are only interested in person and content\r\n+\t\t\t# Therefore use value (content) to  locate and split off the person from the name (fullText)\r\n+\t\t\tcontent = self.value.replace('\\r', '\\n').strip()\r\n+\t\t\tcontentStartIndex = fullText.find(content)\r\n+\t\t\tpretext = fullText[:contentStartIndex]\r\n+\t\telse:\r\n+\t\t\t# For other versions of Lync / Skype for Business, self.value is just None.\r\n+\t\t\t# So we just look at self.name formatting to split content from person and timestamp (less robust).\r\n+\t\t\tpattern = r'^(?P<name>.+?): (?P<priority>.*?), , (?P<content>.+),(?!, , ) , (?P<timestamp>.+)'\r\n+\t\t\tmatch = re.match(pattern, self.name, flags=re.DOTALL)\r\n+\t\t\tif match:\r\n+\t\t\t\tpretext = match['name']\r\n+\t\t\t\tpriority = match['priority']\r\n+\t\t\t\tcontent = match['content']\r\n+\t\t\t\tif priority:\r\n+\t\t\t\t\tcontent = priority + ', ' + content\r\n+\t\t\telse:\r\n+\t\t\t\t# In case no match is found, log the unexpected message and return the whole message.\r\n+\t\t\t\tlog.error(f'Unrecognized pattern in the following message: {self.name}')\r\n+\t\t\t\tpretext = ''\r\n+\t\t\t\tcontent = self.name\r\n+\t\t\tcontent = content.replace('\\r', '\\n').strip()\r\n \t\tcontentLines=content.split('\\n')\r\n-\t\tcontentStartIndex=fullText.find(content)\r\n-\t\tpretext=fullText[:contentStartIndex]\r\n \t\t# There are some annoying comma characters  after the person's name \r\n \t\tpretext=pretext.replace(' ,','')\r\n \t\t# If the objects are the same, the person is the same, and the new content is the old content but with more appended, report the appended content\n", "issue": "nvda does not automatically read messages received on skype for business\n\r\n### Steps to reproduce:\r\nI'm sure I've seen this working for some time.\r\nI have not used skype for business for a long time but in my current work I'm making use of it again, and when I received a message on skype for business, nvda did not automatically read the received message.\r\nOpen a conversation on skype for business type something and wait inside the conversation for your partner to respond.\r\n### Actual behavior:\r\nThe nvda is mute.\r\n### Expected behavior:\r\nNvda should automatically announce the response received.\r\n### System configuration\r\n#### NVDA installed/portable/running from source:\r\ninstall\r\n#### NVDA version:\r\n2018.4.1\r\n#### Windows version:\r\n10 17134.556\r\n#### Name and version of other software in use when reproducing the issue:\r\noffice 16.0.4266.1001\r\n\r\n#### Other information about your system:\r\n\r\n### Other questions\r\n#### Does the issue still occur after restarting your PC?\r\nyes\r\n#### Have you tried any other versions of NVDA?\r\nno\n", "before_files": [{"content": "#A part of NonVisual Desktop Access (NVDA)\r\n#This file is covered by the GNU General Public License.\r\n#See the file COPYING for more details.\r\n#Copyright (C) 2017 NV Access Limited\r\n\r\n\"\"\"appModule for Microsoft Skype for business. \"\"\"\r\n \r\nimport ui\r\nfrom NVDAObjects.UIA import UIA\r\nimport appModuleHandler\r\n\r\nclass NetUIRicherLabel(UIA):\r\n\t\"\"\"A label sometimes found within list items that can fire live region changes, such as for chat messages.\"\"\"\r\n\r\n\tdef event_liveRegionChange(self):\r\n\t\t# The base liveRegionChange event is not enough as Skype for Business concatinates recent chat messages from the same person within the same minute\r\n\t\t# Therefore, specifically strip out the chat content and only report the most recent part added.\r\n\t\t# The object's name contains the full message (I.e. person: content, timestamp) loosely separated by commas.\r\n\t\t# Example string: \"Michael Curran : , , Hello\\r\\n\\r\\nThis is a test , 10:45 am.\"\r\n\t\t# Where person is \"Michael Curran\", content is \"Hello\\nThis is a test\" and timestamp is \"10:45 am\" \r\n\t\t# The object's value just contains the content.\r\n\t\t# Example: \"Hello\\rThis is a test\"\r\n\t\t# We are only interested in person and content\r\n\t\t# Therefore use value (content) to  locate and split off the person from the name (fullText)\r\n\t\t# Normalize the usage of end-of-line characters (name and value seem to expose them differently, which would break comparison)\r\n\t\tcontent=self.value.replace('\\r','\\n').strip()\r\n\t\tfullText=self.name.replace('\\r\\n\\r\\n','\\n')\r\n\t\tcontentLines=content.split('\\n')\r\n\t\tcontentStartIndex=fullText.find(content)\r\n\t\tpretext=fullText[:contentStartIndex]\r\n\t\t# There are some annoying comma characters  after the person's name \r\n\t\tpretext=pretext.replace(' ,','')\r\n\t\t# If the objects are the same, the person is the same, and the new content is the old content but with more appended, report the appended content\r\n\t\t# Otherwise, report the person and the initial content\r\n\t\truntimeID=self.UIAElement.getRuntimeId()\r\n\t\tlastRuntimeID,lastPretext,lastContentLines=self.appModule._lastLiveChatMessageData\r\n\t\tcontentLinesLen=len(contentLines)\r\n\t\tlastContentLinesLen=len(lastContentLines)\r\n\t\tif runtimeID==lastRuntimeID and pretext==lastPretext and contentLinesLen>lastContentLinesLen and contentLines[:lastContentLinesLen]==lastContentLines:\r\n\t\t\tmessage=\"\\n\".join(contentLines[lastContentLinesLen:])\r\n\t\telse:\r\n\t\t\tmessage=pretext+content\r\n\t\tui.message(message)\r\n\t\t# Cache the message data for later possible comparisons \r\n\t\tself.appModule._lastLiveChatMessageData=runtimeID,pretext,contentLines\r\n\r\nclass AppModule(appModuleHandler.AppModule):\r\n\r\n\t# data to store the last chat message (runtime ID,person,content lines)\r\n\t_lastLiveChatMessageData=[],\"\",[]\r\n\r\n\tdef chooseNVDAObjectOverlayClasses(self,obj,clsList):\r\n\t\tif isinstance(obj,UIA) and obj.UIAElement.cachedClassName=='NetUIRicherLabel':\r\n\t\t\tclsList.insert(0,NetUIRicherLabel)\r\n\t\treturn clsList\r\n\r\n", "path": "source/appModules/lync.py"}], "after_files": [{"content": "#A part of NonVisual Desktop Access (NVDA)\r\n#This file is covered by the GNU General Public License.\r\n#See the file COPYING for more details.\r\n#Copyright (C) 2017 NV Access Limited\r\n\r\n\"\"\"appModule for Microsoft Skype for business. \"\"\"\r\n\r\nimport ui\r\nfrom NVDAObjects.UIA import UIA\r\nimport appModuleHandler\r\nfrom logHandler import log\r\n\r\nimport re\r\n\r\n\r\nclass NetUIRicherLabel(UIA):\r\n\t\"\"\"A label sometimes found within list items that can fire live region changes, such as for chat messages.\"\"\"\r\n\r\n\tdef event_liveRegionChange(self):\r\n\t\t# The base liveRegionChange event is not enough as Skype for Business concatinates recent chat messages from the same person within the same minute\r\n\t\t# Therefore, specifically strip out the chat content and only report the most recent part added.\r\n\t\t# When not empty, the object's name contains the full message (I.e. person: content, timestamp)\r\n\t\t# loosely separated by commas.\r\n\t\t# Example string: \"Michael Curran : , , Hello\\r\\n\\r\\nThis is a test , 10:45 am.\"\r\n\t\t# Where person is \"Michael Curran\", content is \"Hello\\nThis is a test\" and timestamp is \"10:45 am\" \r\n\t\t\r\n\t\t# Normalize the usage of end-of-line characters (name and value seem to expose them differently, which would break comparison)\r\n\t\tfullText=self.name.replace('\\r\\n\\r\\n','\\n')\r\n\t\t\r\n\t\t# At the object's creation, an unuseful liveRegionChange event is triggered with an empty name,\r\n\t\t# so we discard it.\r\n\t\tif not self.name.strip():\r\n\t\t\treturn\r\n\t\t\r\n\t\tif self.value is not None:\r\n\t\t\t# For some versions of Lync / Skype for Business, the object's value contains just the content.\r\n\t\t\t# Example: \"Hello\\rThis is a test\"\r\n\t\t\t# We are only interested in person and content\r\n\t\t\t# Therefore use value (content) to  locate and split off the person from the name (fullText)\r\n\t\t\tcontent = self.value.replace('\\r', '\\n').strip()\r\n\t\t\tcontentStartIndex = fullText.find(content)\r\n\t\t\tpretext = fullText[:contentStartIndex]\r\n\t\telse:\r\n\t\t\t# For other versions of Lync / Skype for Business, self.value is just None.\r\n\t\t\t# So we just look at self.name formatting to split content from person and timestamp (less robust).\r\n\t\t\tpattern = r'^(?P<name>.+?): (?P<priority>.*?), , (?P<content>.+),(?!, , ) , (?P<timestamp>.+)'\r\n\t\t\tmatch = re.match(pattern, self.name, flags=re.DOTALL)\r\n\t\t\tif match:\r\n\t\t\t\tpretext = match['name']\r\n\t\t\t\tpriority = match['priority']\r\n\t\t\t\tcontent = match['content']\r\n\t\t\t\tif priority:\r\n\t\t\t\t\tcontent = priority + ', ' + content\r\n\t\t\telse:\r\n\t\t\t\t# In case no match is found, log the unexpected message and return the whole message.\r\n\t\t\t\tlog.error(f'Unrecognized pattern in the following message: {self.name}')\r\n\t\t\t\tpretext = ''\r\n\t\t\t\tcontent = self.name\r\n\t\t\tcontent = content.replace('\\r', '\\n').strip()\r\n\t\tcontentLines=content.split('\\n')\r\n\t\t# There are some annoying comma characters  after the person's name \r\n\t\tpretext=pretext.replace(' ,','')\r\n\t\t# If the objects are the same, the person is the same, and the new content is the old content but with more appended, report the appended content\r\n\t\t# Otherwise, report the person and the initial content\r\n\t\truntimeID=self.UIAElement.getRuntimeId()\r\n\t\tlastRuntimeID,lastPretext,lastContentLines=self.appModule._lastLiveChatMessageData\r\n\t\tcontentLinesLen=len(contentLines)\r\n\t\tlastContentLinesLen=len(lastContentLines)\r\n\t\tif runtimeID==lastRuntimeID and pretext==lastPretext and contentLinesLen>lastContentLinesLen and contentLines[:lastContentLinesLen]==lastContentLines:\r\n\t\t\tmessage=\"\\n\".join(contentLines[lastContentLinesLen:])\r\n\t\telse:\r\n\t\t\tmessage=pretext+content\r\n\t\tui.message(message)\r\n\t\t# Cache the message data for later possible comparisons \r\n\t\tself.appModule._lastLiveChatMessageData=runtimeID,pretext,contentLines\r\n\r\nclass AppModule(appModuleHandler.AppModule):\r\n\r\n\t# data to store the last chat message (runtime ID,person,content lines)\r\n\t_lastLiveChatMessageData=[],\"\",[]\r\n\r\n\tdef chooseNVDAObjectOverlayClasses(self,obj,clsList):\r\n\t\tif isinstance(obj,UIA) and obj.UIAElement.cachedClassName=='NetUIRicherLabel':\r\n\t\t\tclsList.insert(0,NetUIRicherLabel)\r\n\t\treturn clsList\r\n\r\n", "path": "source/appModules/lync.py"}]}