Prevent endless loop when calling QWaylandShmWindow::format().
Prevent endless loop when calling QWaylandShmWindow::format().

ntanibata/qtwayland,locusf/qtwayland-1,ntanibata/qtwayland,ntanibata/qtwayland,Tofee/qtwayland,Tofee/qtwayland,locusf/qtwayland-1,Tofee/qtwayland,locusf/qtwayland-1,locusf/qtwayland-1