- refine the use of the "active group item", with differential styling, and not clearing when we enter the tab view
- set the active group item in other cases, like when we drag out groups, when we resize or move a group, or when a group is a drop target
- removed new tab group (you may have to clear storage to get rid of your locked New Tabs group at the bottom of your screen)
- rm various special casing for the new tab group
- new tab experience for tabs-off-of-orphaned-tabs is implemented: they magically turn into a group, and it even snaps!
- broken: new tabs made with no active context
- broken: closing the last tab in a group: should go back to tab candy view
- broken: first run experience grouping of orphaned tabs
+ TabItem updates (painting, etc) no longer happen when the Tab Candy UI is not visible; they're queued up and happen when you return to the UI
+ Fixed a couple problems with the TabItems pause painting mechanism
+ If a whole bunch of TabItem updates come at the same time, we spread them out (using a heartbeat that lasts until we run out of backlog)
+ This should fix both Bug 580954 (Replace the heartbeat with something smarter) and Bug 583420 (Tab thumbnails don't repaint after being resized)
+ fixed our use of undefined in iq.js
+ more tabItems cleanup, including removing a stray call to the now non-existent TabCanvas.detach()
+ "Group sites" no longer makes a "mixed" group if it would be empty
+ Cleaned up a bunch of unneeded properties and methods in tabitems.js
+ moved profile.js to the top of tabcandy.js, so the script loading timer is accurate
