Macromedia (now Adobe, but formerly Allaire before it became part of Macromedia) have an editor called Homesite that supports folding. By default, it folds on HTML tags
I think you may be able to change it to work on user defined tags.
This editor I think developed into that used in Dreamweaver. There is a feature called the "tag inspector" which allows you to manipulate nested tags.
And yes, it does meet Ian's test.
From: owner-occam-com@xxxxxxxxxx [mailto:owner-occam-com@xxxxxxxxxx] On Behalf Of Ian East
Sent: 14 December 2006 17:23
To: Barry Cook
Cc: Occam Family
Subject: Re: Inline VALOF
On 14 Dec 2006, at 16:18, Barry Cook wrote:
We all asked for a bit more, but got Unicode, in a dozen different flavours. Modest lumps of UTF-16 i feel add a lot, without too much pressure on input devices. Have adopted UTF-16 for Honeysuckle, but only to add a smackerel (like ≤ and ≥).
Text editors manage well IMHO. It's the keyboards that are limited. Maybe there's a market for an additional keypad for those extra unicode tidbits.
I always hated having to recall keyboard combinations. It would never prove popular. Take emacs commands for example - much hated by every student on my C course.