Stuff Michael Meeks is doing

Attempted to recover from jet-lag, I lost a day somewhere which can't be good.
Stared at gnome-ui-handler marvelling at the way hints work, concluded that code was cut & pasted from gnome-app-helper. Began to doubt my sanity, and understanding of everything.
Re-implemented gnumeric's evaluation queue for speed; discovered this didn't speed anything up; whacky, realised more understanding of the problem was needed. It appears the problem is _purely_ searching the dependency space per cell created. Using the current approach this neccessarily involves an N*N operation, regardless of how cunning we can make the evaluation queue. Some of the tricks I plan for the style code have to be used here, luckily in contrast with that, the majority of these dependencies are moderatley local. I think a nested range-list cache would be ideal. This would store the dependencies for a set of ranges which would home in on the current area of interest over the cache, thus utilising whatever localilty of reference we can achieve, this can sometimes be quite high. Possibly a multi tree'd cache approach would be better, and we can of course insert / remove items with ease ensuring no cache flushes.
Started trying to put some emacs tricks into practice from Nat & Ettore, old habits dye a sort of beige colour.