test: indicate progress to screen reader users

[meganrogge]

Refs #209661, #196396, #210590

• Windows @dbaeumer
• macOS @eleanorjboyd
• Linux @roblourens

Complexity: 4

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Formerly, progress information wasn't communicated to screen reader users. Now, anywhere we have a progress bar, if it takes more than seconds, a progress signal will be played and then repeat every five seconds.

This happens when something is very slow, such as:

• the first time a notebook editor is loaded
• running a notebook cell with a sleep call or a lot of processing
• running an @workspace chat request

The sounds will play in parallel if several things are in progress simultaneously.

• Enable a screen reader. Verify that any time a progress bar is shown for more than 3 seconds, you hear this sound.
• Disable this accessibility.signals.progress setting. Verify that you don't hear it.
• Disable screen reader mode. Verify that you don't hear it.
• Add this to your settings file, reload the window, verify that the migration to accessibility.signals.progress has succeeeded

accessibility.signals.chatResponsePending: {
   "sound": "off",
   "announcement": "off"
}

[eleanorjboyd]

When I try and put " "accessibility.signals.chatResponsePending": {
"sound": "off",
"announcement": "off"
}" in my settings (both workspace and user level) it grays out and says "Unknown Configuration Setting". Is there something else I need to enable?

[roblourens]

That seems by design @eleanorjboyd, it's deprecated