This code didn't actually use QMutableEventPoint::from(), so didn't
run into the UB that from() depended on, but it's in the way of making
QMutableEventPoint a befriendable namespace instead of a public
subclass of QEventPoint.
Replaced the QMutableEventPoint ctor that takes a timestamp, and
therefore isn't compatible with the ctors on QEventPoint, with a
static function that returns QEventPoint instead.
Port QList initialization to braced-initialization as a drive-by.
Task-number: QTBUG-99615
Pick-to: 6.3
Change-Id: If5a1dbea21cc31cdefdb640716793421c8ec0af4
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
cfca4188f9