Fix SplitView crash when using certain attached propertiesv5.13.0-beta1

If the attached property object was created on an item that SplitView
doesn't manage, then its m_splitView member will be null, so check
for that.

Sometimes, an attached SplitView object will be created on an item
that SplitView _does_ manage, but SplitView's own contentItem hasn't
been created yet (see the comment in the QQuickSplitViewAttached
constructor). In that case the SplitView will see the item added
as a child of its contentItem eventually, and we just have to wait.
While we are waiting, check access to our members in case they are
null.

Fixes: QTBUG-74276
Change-Id: I70b7f017e621e0d15c239b962f0407743eb70b15
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

0 files changed, 0 insertions, 0 deletions