both preserved-rebuild and revdep-rebuild didn't show anything but I had to recompile oxygen beucase all qt4 apps (like kmail) looks without the oxygen theme.
I had to recompile also kde-apps/kdepim-runtime because of a crash in kmail.
Hm, we can't add subslot operator without changing Qt4 ebuilds as well, but then there will never ever be another Qt4 release. Should we just stable-revbump these affected packages with a dependency on >=Qt-4.8.7?
dunno if it is the right way...but we don't have a lot o choice.
Revbump added dependency on >=Qt-4.8.7 in git commit 6b677076a3ea21e0f6aaab0785fea1c5e8282fae