Am 18.09.2017 um 14:28 schrieb Jean-Marc Lasgouttes <lasgout...@lyx.org>: > > Le 18/09/2017 à 12:48, Stephan Witt a écrit : >> Doesn’t help, sorry. >> Perhaps the black screen is „painted“ by the null painter? > > The NullPainter is really something that cannot paint. It does not rely on Qt > at all. > > Can you try the following? I had removed these calls but I am not sure what > they were good for. You could also try to remove the > viewport()->setAttribute(Qt::WA_OpaquePaintEvent);
The patch makes no difference again, sorry. Removing the mentioned line changes it to gray background. Stephan Screen-shot after line-down key press.
