Re: feature request: indicator of minibuffer-recursion depth

[Richard Stallman]

    Recursive-edit depth is indicated in the mode line by bracketing ([...]).
    Being in a recursive minibuffer without knowing it is about as disorienting
    as being in a recursive edit without knowing it. AFAIK, there is no feedback
    regarding minibuffer-recursion depth.

Recursive minibuffers are disallowed by default.  The few commands
that allow them as an exception will not often be used by beginners,
and C-g should get out anyway.

    How do you think put [] on the prompt in minibuffer like:

    [M-x] 
    [[M-x]]
    [[[Find file: ]]] ~/

It could be an improvement, for those who set the variable
to allow recursive minibuffers.  I think this would be better
than putting it in the mode line.  It is more clearly
related to the minibuffer if it is in the minibuffer prompt,
and more visible too.

However, this should wait for after the release.  Can someone
add this to etc/TODO?