[PyQt] A question about QDockWidget layout

[flya flya]

I make a dock widget on top, and central widget at bottom, I hope the
dock widget has minimum size when changing the contents on it, but its
size often bigger, I tried to change sizePolice, but can't make to
work, the only way I found is use
setFixedHeight(layout.minimumSize().height()), then It became minimum
size, but it became fixed too. I hope it have a minimum size when
layout and not be fixed ,how to do it?

please see attachment, click the button to change the content on dockwidget.
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