Created attachment 447030 [details, diff] Placed in /etc/portage/patches/media-gfx/krita/ this patch works around the file collisions Renaming the live-ebuild from kde overlay to krita-3.0.1.ebuild works (tested with qt-5.7, which still is masked) except for two file collisions with kde-plasma/breeze-5.7.5, which could be worked around with the attached patch.
Thanks, bumped in git. https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=692d0c2c43277aa789d73082b521b0794ac2ddc9