See also https://cgit.freedesktop.org/wayland/wayland-protocols/tree/stable/xdg-shell/xdg-shell.xml#n234 .
Kudos to Greg V for his original patch in jira.
Fixes: QTBUG-87303 Pick-to: 5.15 6.2 6.3 Done-with: Greg V greg@unrelenting.technology Change-Id: I57df9aedea7cc6f0b6fa142a6fc6c3bdc98324c8 Reviewed-by: David Edmundson davidedmundson@kde.org (cherry picked from commit 59a5fe99)