implementing BIDI isolates, and make LRM and RLM visible

[Uwe Brauer]

Hello

According
https://www.gnu.org/software/emacs/manual/html_node/elisp/Bidirectional-Display.html
the actual BIDI support «does not yet support the isolate directional
formatting».

I presume that has to do with fact that if in one line I mix say Hebrew
with English text and I want to switch editing between them then, in
order to do that in any comfortable way (cursor movements etc) I end up
that the whole buffer will be displayed either R2L or L2R and not the
individual paragraphs.

In any case I wish I could help implementing this missing feature, but I
cannot so I simply ask: any plans for the near future?

Meanwhile I try to use LRM and RLM to deal with such situations. However
is there a way to make them visible, at least buffer local?

thanks

Uwe Brauer