joomla/joomla-cms — pull request #2253 by okonomiyaki3000 (2013-10-15 06:21:31+00:00)
Title: Activate the hidden option 'log category mode' since JLog supports this ...

...now.

This feature has existed since the debug plugin started handling logs but it was hidden because JLog didn't support category exclusion at the time. Now it does so start using this feature.