joomla/joomla-cms — pull request #5474 by jrseliga (2014-12-20 08:19:55+00:00)
Title: Support multiple tags filtering in Administrator ContentModelArticles

### Summary
Allows articles to be filtered by multiple tags in Administrator.

### Testing (Administrator)
- Assign different tags to different articles
- View Articles
- Use Search Tools and select multiple tags
- Should filter list to show all articles that contain any of the tags selected