immediately if the element is already expanded.

Reviewed by Adam Roben.

* page/inspector/treeoutline.js:
(TreeElement.prototype.get shouldRefreshChildren): Return this._shouldRefreshChildren.
(TreeElement.prototype.set shouldRefreshChildren): If changing to true, and
already expanded,
call expand again to trigger the refresh. Sets this._shouldRefreshChildren.
(TreeElement.prototype._attach): Check for this._shouldRefreshChildren.
(TreeElement.prototype.expand): Ditto.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31644 268f45cc-cd09-0410-ab3c-d52691b4dbfc