Accessibility label updates for Views using accessibilityLiveRegion are not being read aloud by Narrator

[jagorrin]

Environment

1. react-native -v:
   react-native-cli: 2.0.1
   react-native: 0.60.6
2. npm ls rnpm-plugin-windows:
   rnpm-plugin-windows@0.3.5
3. npm ls react-native-windows:
   react-native-windows@0.60.0-vnext.39
4. node -v:
   v10.15.0
5. npm -v:
   6.13.1

Then, specify:

• Target Platform Version(s): 10.0.18362.0

• Target Device(s): Desktop

• Visual Studio Version: 2017

• Build Configuration: Debug

Steps to Reproduce

1. Create a View and provide it an accessibilityLiveRegion of 'assertive'
2. Enable Narrator
3. Update the accessibilityLabel of the View created in step 1

Expected Behavior

Narrator will announce the accessibility label when it changes.

Actual Behavior

Accessibility label is not read aloud.

Additional context

When a breakpoint was placed in UpdateProperties in FrameworkElementViewManager, the execution never entered the code in the propertyName == "accessibilityLiveRegion" conditional. Locally, I added the accessibilityLiveRegion prop to the list of props in GetNativeProps in the same file, and then the accessibility label was read when it updated, as I expected. It looks like today accessibilityLiveRegion is being filtered out since it is not in the list in GetNativeProps.

[chrisglein]

Likely not yet implemented, we may not be listening to the events and updating as expected here.

[jagorrin]

I merged in a change that resolves this issue, so I am closing it.