This is a start towards implementing the 02 overlay design. The
default applications has moved into GConf. We keep around an AppDisplay
instance for handling the right side behavior.
With commit a3d35af444445b92b3fe2475ebef4e282b8c34d1 variable
itemInfo in js/ui/appDisplay.js was changed to a new object
(AppInfo from js/misc/appInfo.js) but some of the code in
js/ui/appDisplay.js wasn't updated accordingly. This commit
fixes that and makes the search box in the overlay usable
again.
This lets us share the recent-app-tracking, recent-file-tracking, and
icon-drawing code between the overlay and the sidebar, without the
sidebar having to poke into AppDisplayItem and DocDisplayItem's guts.
