Thanks, @hturner and @ajrgodfrey for all this great feedback! I was hoping to get time to ask to look at this in person at the R sprint but, alas, I ended up working on other things.

This one is particularly bad, but hopefully it can be fixed since we're using react-accessible-treeview for the file explorer component.

There were two related issues here:

1. Selecting a directory using keyboard navigation did not then open that directory. This should now be fixed once commit 7df7964 goes live.

2. It was not clear to sighted users the difference between focusing/hovering on a directory and actually selecting it. In both cases, the visual effect was the same. To keyboard navigate to a different directory, one must keyboard up/down and then press Enter or Space to select it. When commit 7df7964 goes live the visual effects will be different for selection and focus, and so hopefully clearer to sighted users what is happening with the keyboard navigation.

I'm fairly confident navigation with the screen reader should work better now, so I will close the issue. But feel free to let me know with a reply if there are still issues and I will reopen.

(It will take a few hours for the webR website to update, but the changes should be available by tomorrow.)