R1:27a60bdb3c8b

Conpherence - make the durable column kind of work and stuff

Summary:
Ref T7014. This hooks up the durable column such that when you open it up it loads your most recent Conpherence. You can then switch amongst the various widgets and stuff and everything works nicely.

Except...

- scroll bar does not work
- also doesn't work at HEAD when I add a ton of text to the UI with no changes? (wrapped $copy in array_fill(0, 1000, $copy))
- "widget selector" does not collapse when you select something else…