It doesn't work right now because View unconditionally sends refresh to
its textContext, but textContext can be a draw buffer which does not
respond to refresh. Still, these changes (notably the assignment chain
in qwaq-group.r really pushed qfcc).
The conditional selector performance seems to work nicely, but I've
found a mistake with View.window (partly, realizing why my old lib (and
probably TV in the first place) had separate textContext and buffers
between views and groups).
