[Qt-interest] How to re-lay out items in QListView on dataChanged()

[Dmitry Teslenko]

Hello!

I have QListView in ItemView mode that shows previews of windows and
window captions beneath.
Windows are of different sizes, so my QListView's model provide data
for Qt::DecorationRole and Qt::SizeHintRole.

In scenario 1 I have all previews ready and after model reset QListView
lays out all previews according its size hints.

In scenario 2 I have only list of windows ready and worker threads preparing
previews. After model reset QListView lays out previews stubs and waits.
Thren previews are finally ready, model emits dataChanged() signals to
notify QListView it's time to update previews. QListView re-reads previews
from model and shows them nicely. Bad thing QListView doesn't also
re-layout items and some of them looks cropped.

How to trigger QListView item re-layout?

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