It is better to use QSharedData and QExplicitlySharedDataPointer then
doing manual ref counting.
Change-Id: I5674046141701bd48a53415ab96fcb6b538e79e6
Reviewed-on: http://codereview.qt.nokia.com/1440
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Olivier Goffart <olivier.goffart@nokia.com>
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12