Nav block Offcanvas toggle button should toggle and transfer focus

[getdave]

As reported in #46939 (comment) activation of the offcanvas using the button in the block toolbar doesn't transfer focus to the offcanvas panel which is the intent.

Moreover the button should be a toggle to communicate the open/closed status of the list view.

[draganescu]

I think we should remove this button. I think it's a superfluous addition for #42257 (comment), provides no extra value, and it is confusing.

[getdave]

@draganescu Did we remove the button in the end?

[alexstine]

From what I gather, the navigation list view is always open. It is static in the inspector DOM sidebar. The button still needs to stay as it would serve as a quick focus jump for screen reader users and keyboard only users. Tabbing all the way down to the navigation list view is simply not practical. This part of the editor heavily relies on the different DOM events. For screen readers specifically, they need to stay in edit/focus mode so the application (us) can handle where focus should go. The quickest way however currently would be for screen reader users to force their mode to browse mode and manually navigate to the navigation list view. Then they must force their screen reader mode back to focus to interact with the tree grid. This is work we must do.

Question is, is it better to focus the section or the tree grid? Is it important for users to first understand which menu they are editing? Likely so. At least that moves them much closer.

Thanks.

[jasmussen]

The button seems good to have, not only for transferring focus, but to open the inspector in case it's closed.

Focus could be on the first item as one option, as shown here with the focus ring around the "blog" menu item:

Another option, depending on where focus needs to land, is to just show the focus ring around the panel itself:

Yet another option is to have a region highlight through an animated border, like this codepen.

[draganescu]

#47032 removed the button. Is this issue still relevant?