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Friedrich W. H. Kossebau authored
* QT_USE_FAST_OPERATOR_PLUS is subset of set QT_USE_QSTRINGBUILDER * QT_USE_FAST_CONCATENATION got dropped pre-Qt5
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* QT_USE_FAST_OPERATOR_PLUS is subset of set QT_USE_QSTRINGBUILDER * QT_USE_FAST_CONCATENATION got dropped pre-Qt5