Good feedback. Thanks. Assigning to december to investigate.

We do not set all the needed aria properties on the subnodes. One of them being the expanded and collapsed state.
So idealy we would set the aria-expanded somewhere here
Missing issue: currently the navigationController has no event to listen to update the expanded flag.
I do not think it is a big issue, thus assigning to backlog candidates until users complain.

Hi, please could I have this issue? Saw this ad on Reddit and thought I should get involved!

@davidackroyd99 this issue is not so trivial, however if you would like to take a stab feel free. Once you have something working ping me on the PR. How the tree sets the activedescendent for the compact subnodes might be a good example how this could potentialy be done.

cheers :) will let you know when I have something!

Pending a proper fix, could explorer.compactFolders default to false if not otherwise set if screen reader usage is detected? It causes some difficulty when trying to navigate in the explorer view.

@Neurrone let's assign to next milestone so we look into a proper fix. Thanks for bringing this up.
If we do not fix it, we can disable the compactFolders for screen readers.

Pushed a fix for this such that we now properly set the aria-expanded and aria-level property on the compact nodes. I tested it and seems to work fine for me.
@Neurrone try it out and let us know what you think. Thanks!

There's still something weird happening here. I get an extra "collapsed" when I click on the rightmost folder to expand it. I just expanded it, should it read collapsed like that (it doesn't for non-compact nodes).

narrates:
level 6 classification not selected collapsed
expanded

Still, it is much better, so it could still be considered verified.

Thanks @alexr00 for looking into this. I just checked the corner case you mentioned and I can indeed reproduce this. However since screen readers users do not use the mouse, and this issue can not be reproduced with the keyboard I am fine living with this.
Thus closing this and adding verified label as you said that it can be considered verified.