Look at what mathed does: At a very high level (i.e InsetFormula::draw) the work is split. The first call to width() calls metrics() [ok, this is messy, but currently the easiest way to make sure that metrics() is called after loading of a buffer, too]. Afterwards, the real draw part is done, by calling the nested inset's draw() [which do not contain metrics computations anymore]
I told you this already a lot of times, the redraw of mathed is "really" easy to do. You have all fixed width insets and the don't do a rebreak or resize themselfs to their environment. You cannot compare this to the complexity of InsetText you may compare this to a inset like lets say a InsetTabular if we wouldn't have the posibility of autobreaking rows (as it was in the first draft of the inset).
Jug
-- -._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._ Dr. Jürgen Vigna E-Mail: [EMAIL PROTECTED] Mitterstrich 151/A I-39050 Steinegg Web: http://www.lyx.org/~jug -._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._-._
