Referencing Qt patch: https://codereview.qt-project.org/#/c/224684/ Gentoo has this patch applied to the 5.9.5 branch, but it also is required against 5.9.6. Review qsgrenderloop.cpp from Qt 5.9.6 on Qt's git here: http://code.qt.io/cgit/qt/qtdeclarative.git/tree/src/quick/scenegraph/qsgrenderloop.cpp?h=v5.9.6 In functions QSGGuiThreadRenderLoop::hide (lines 304 - 308) and QSGGuiThreadRenderLoop::maybeUpdate (lines 495-502) we see the unpatched code.
Okay, I just noticed the ebuild for 5.9.6 references the existing patch file. Sorry for the noise.