When a link is dynamically set multi-line and you navigate onto it with mouse, only 1st line is underlined. E.g. go to bugs.kde.org and then, on the left side of the website, move your cursor over "Report ownership counts and charts" and you should see the bug. This happens in rekonq and arora. original bug report: https://bugs.kde.org/show_bug.cgi?id=226471
I don't have the problem with Qt trunk + WebKit trunk.