What's the correct way to report a regression?

I've notice, back in PHP 5.4.0 beta 2, that this test was failing: Bug #48555 (ImageFTBBox() differs from previous versions for texts with new lines) [ext/gd/tests/bug48555.phpt] So I went to https://bugs.php.net/bug.php?id=48555 and left a comment. The same test still fails in 5.4.0RC1 and also for 5.3.9RC1. Now, I have no idea if this is really a critical or important issue, but apparently a test exists for it and it fails now. So how should I go about reporting it so that somebody looks into it and decides if it's worth fixing? Since I'm not the original reporter of bug #48555, I can't edit it to update the affected PHP version. Should I have opened a new bug report instead? Would that have gotten someone's attention? bye, Dirk