--- Comment #15 from Wolfgang Bauer firstname.lastname@example.org --- (In reply to Mark Petersen from comment #14)
I see that there was a QT patch here: https://codereview.qt-project.org/#/c/215221/ I'm not sure if this was backported to QT 5.10.
It's not yet in Tumbleweeed, but an update with this patch (and some more additional backported patches) is on the way: https://build.opensuse.org/request/show/570546
If there is additional information that I can provide please ask.
You could test the updated package when it is in Tumbleweed, and report back whether it acually does fix your problem... ;-)