... and make it a hidden friend. This avoids ODR violations when, because they can't use ours (private, and not exported), users try to produce their own version of qHash(Key). [ChangeLog][QtGui][QPixmapCache] Made the qHash() overload for QPixmapCache::Key public (was: private) API. Change-Id: I324ed001c0ae0a251ac2e1d04713013452ffff9c Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io> (cherry picked from commit 7fa3267fda6cff720cca44e829f9a39789031a54) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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