https://bugs.kde.org/show_bug.cgi?id=427311

--- Comment #1 from Kai Uwe Broulik <k...@privat.broulik.de> ---
It appears to be
const_cast<QDialog*>(dialog)->setContentsMargins(margins.left(),
qMax(margins.top(), 1), margins.right(), margins.bottom());
It changes the content margins which probably causes the preview to repaint in
response to a change of available area.

Imho it's quite bad to tamper with widgets like this in the paint pass. Isn't
polish meant to be used for such preparation?

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