joomla/joomla-platform — pull request #1363 by ShMaunder (2012-07-13 21:01:02+00:00)
Title: [CMS #28823] Re-add isError into the JError legacy class

Not sure the reason for the removal of isError() from the JError legacy class in J3.0 Alpha 1 - https://github.com/joomla/joomla-platform/pull/802 ?

I understand its old and "instanceof Exception" is the better way... but it just seems like this removal might break any extensions that use it (including my old code).

If we have a legacy class, we may as well keep it all in tact.

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=28823