This is a follow-up of Mdk bug http://qa.mandrakesoft.com/show_bug.cgi?id=3152 : when DPI is not set to default system dpi (for instance, settings DPI to 91, either by using mozilla setting or using gnome-font-properties), scrolling some webpages (for instance http://garoo.net/en/ ) might alter some lines (more screenshot on the initial bug report). Just selecting one work on the corrupted line correct the rendering. Bug was initially reported on mozilla 1.4 xft/gtk2 but it is still present in 1.6final and 1.7 beta (tested on Mandrakelinux 10.0)
*** Bug 238508 has been marked as a duplicate of this bug. ***
Dupe of bug 94739?
Is this still a problem? We've made a whole lot of changes to DPI handling since 2004.
I'd be very surprised if we were still affected by this.