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Updated user-guide.md

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Uwe Kindler 2020-09-21 11:07:00 +02:00
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@ -493,12 +493,12 @@ auto* CentralDockArea = DockManager->setCentralWidget(CentralDockWidget);
See the `centralwidget` example to learn how it works.
<div style="background: #fff6e8; border: 1px solid #ffa51a; padding: 6px;">
The central widget needs to be the first dock widget that is added to the
dock manager. The function does not work and returns a nullptr if there
are already other dock widgets registered. So setCentralWidget should be
the first function when adding dock widgets.
</div>
> ##### Note
> The central widget needs to be the first dock widget that is added to the
> dock manager. The function does not work and returns a `nullptr` if there
> are already other dock widgets registered. So `setCentralWidget` should be
> the first function that you call when adding dock widgets.
## Styling