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→Purpose of incremental layout: fix link to include M-ID
==== Purpose of incremental layout ====
(This section is taken from [http://groups.google.com/group/netscapegroups?selm=20030917230123.publicGA4593@darby.mozilladbaron.layout/msg/0bb4c4820aaa143d org a post dbaron wrote].)
There are certain situations where it's important that we not recompute the layout of everything in the page. (These are in general based on the idea that layout time is roughly linear in the amount of content being laid out.)
