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If the window has non-safe areas, as reflected by the window's
safe area margins, ApplicationWindow will now automatically
pad the content item accordingly, ensuring that the content
item is within the safe area of the window.
To implement this we piggy-back on QQuickControl, letting
the control manage the size and position of the content
item. This allows us to use the built in padding of
QQuickControl to inset the content.
Internally the item hierarchy of ApplicationWindow no
longer represents the header, footer, and menu bar as
children of the ApplicationWindow's content item, but
rather as sibling items in the QQuickWindow content item,
similar to the window's background item.
Doing this is a slight behavior change, but for something
that should have been an implementation detail as far as
users are concerned.
The content control and header, footer and menu bar now all
live within the same root QQuickWindow::contentItem, which
is a focus scope on its own.
End users can override the automatic padding that we do
for the contentItem by setting any of the four new padding
properties that we expose, mirroring the properties on
QQuickControl.
[ChangeLog][Important Behavior Changes] The contentItem
of ApplicationWindow is now automatically padded to
account for safe area margins. To override the automatic
padding, set the padding explicitly, via e.g.
`topPadding: 0`.
Task-number: QTBUG-125373
Change-Id: I986e425a7f316db244c7fc86283b8b333978e3ad
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
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