https://bugs.winehq.org/show_bug.cgi?id=57558
--- Comment #1 from Rafał Mużyło galtgendo@o2.pl --- Bug 57306 had been (and - as of last check - still is) about memory corruption and asserts. The commit itself has been responsible for quite a few more benign (non-crash) regressions. Some were fixed, some still aren't.
(currently, besides the crash, one that grabbed a little of my interest is that drawing in mspaintxp, where straight edges of round rect/elipsis aren't being erased while being shrunk while drawing them; though I don't have 9.18 at hand to check if that is a regression though as I asked, the last answer *seems* to suggest they are; also, sometimes they aren't drawn in the first place...I suspect some integer math issues on the later part, the former is either the same or some incorrect clipping) (since quite a few years back I've played with porting from qt3 to qt4 kseg for my own needs (even got something working in the end) I'm quite aware how much seemingly minor changes may matter (like changing interpretation of the width of filled vs outline rectangle by 1px))