dca3837201
QStringDecoder within std::optional needs QStringDecoder to be fully
defined ("in-size" (Lakos)).
QByteArray, used as a function parameter, can be forward-declard,
though ("in-name-only" (Lakos)).
This also makes the header comply with Qt's private symbol versioning,
which requires every private header to include some other private
header, or, eventually, qglobal_p.h.
Amends 4da14a67a6157c415f8228a8bae7d6b0f895df7c.
Change-Id: I35fed05955f1194299162b576834c1045672bcac
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>
(cherry picked from commit 96f78cbdd9412e6043bb4eb0d0dd818c5d800151)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>