Allow the user to drag faster
defer most processing until after delay
Make the window the holder
Prevent extensions from using window.open() as a quick way to show the user
general, untrusted web content. Throw exception pointing out the 'right'
safe API to use. Still allows file: URLs and relative paths (which are by
definition file: too, and used by Debug > Run Tests).
Allow window.open() with about:blank too (one extenion is using this, and
it's generally useful for programmatically generated UI)
Fix Live CSS with an iframe element
Added unit test, fixed NetworkAgent
Add another unit test, Rename simple2.* test files
Fix RemoteAgent and ScriptAgent
Fix Live CSS bug
Fix unit tests
Cleanups to status bar language-switcher:
* Make LanguageManager the official public API that is used to set per-file
overrides, rather than proxying through Document objects - remove Document.setLanguageOverride()
* Clear path overrides when switching projects, so it's more obvious that
it's not something that gets persisted across sessions
* Simplify how JS Code Hints listen for language updates: remove dependency
on "currentDocumentLanguageChanged" event; remove unneeded extra 'if' tests
Add "Set as Default" menu item to status bar language switcher -- adds a
permanent file extension mapping to preferences, based on the current
file's path-specific language override (if any) and its file extension.
* Gray out status-bar language switcher's "Set as Default" item if the doc's
current language is already the default (i.e. there's no path-specific override).

DropdownButton changes:
* Support disabled items
* Fix bug #8433 (Page Up/Down work oddly) - Only wrap around to other end
of list when using arrow keys. Page Up/Down 'stick' at start/end of list
instead (so they will act like Home/End when there's no scrollbar).
* Add Home/End key support
Only use first selection line when populating FindInFiles bar
add pref to prevent js code hints on dot
update unit tests for extension manager keepFile flag
Track match index in SearchState and show it in place of match count as "X of Y".
Limit _showMatchIndex function call in findNext function only.
Verify match index in SearchState.