bug(datepicker): navigating with ChromeVox keyboard shortcuts does not update selected date

[zarend]

Reproduction

Steps to reproduce:

1. Open the Datepicker Examples
2. Go to the "Datepicker action buttons" demo
3. Activate "Open calendar" button
4. Linear navigate forward (Launcher + Right Arrow in ChromeOS)
5. press space

Expected Behavior

It behaves the same as pressing the right arrow key. It highlights the next day and selects the next day on closing.

Actual Behavior

Screenreader announces the next day, but does not select that day when closing

Environment

OS| Browser | Screen reader
ChromeOS | Google Chrome 91.0.4472.167 | ChromeVox

Additional Notes

This is copied from an internal bug report found during a11y testing.

[zarend]

Here's a repro
https://user-images.githubusercontent.com/7720245/131187430-e99e7d08-a572-4bec-85a6-5f6278416c13.mp4

[zarend]

I can also repro on NVDA using the table specific shortcut keys – Ctrl + Alt + right arrow, Ctrl + Alt + left arrow, etc.

[zarend]

This works on other datepickers, such as the Light Design React datepicker, which also uses a table with role=grid. It also works on another internal datepicker. That means this is something we should be able to fix.