Dark text on dark background tooltips

[plp13]

With certain Qt apps, tooltips are rendered using black / dark gray text on a black /dark gray background when using this theme (at least this is what happens to me). Naturally, this makes the tooltips invisible.

I've described this problem in detail, together with screenshots and a proposed patch/solution, here: https://bbs.archlinux.org/viewtopic.php?id=290830