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Port lessThan() to the collator of Qt 6.12 - #1
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Qt 6.12 removed QAbstractItemModelPrivate::isVariantLessThan(), which the vendored QSortFilterProxyModel::lessThan() called, so it no longer compiled. Do what Qt 6.12's own QSortFilterProxyModel does: keep a QCollator that sort() sets up from the locale awareness and case sensitivity, and compare with QAbstractItemModel::compareData(). Older Qt versions keep using isVariantLessThan(). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Qt 6.12 removed QAbstractItemModelPrivate::isVariantLessThan(), which the vendored QSortFilterProxyModel::lessThan() called, so it no longer compiled. Do what Qt 6.12's own QSortFilterProxyModel does: keep a QCollator that sort() sets up from the locale awareness and case sensitivity, and compare with QAbstractItemModel::compareData().
Older Qt versions keep using isVariantLessThan().
Co-Authored-By: Claude Opus 5.5 noreply@anthropic.com