Implement own lessThan(QVariant, QVariant) #81
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Qt 5.15 deprecated the operator<(QVariant, QVariant). Do get rid of the warning and to prepare for the eventual removal of the operator, implement our own needs in a lessThan() function. The function is based on the description of QSortFilterProxyModel::lessThan(). Fixes oKcerG#77
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The method `QVariant::Type QVariant::type() const` has been deprecated since Qt 6.0. The recommended replacement is `typeId()` or `metaType()`, but these are not available under Qt5. So choose to use `userType()` instead, which is available under both and should cover the use cases as well.
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Qt 5.15 deprecated the operator<(QVariant, QVariant). Do get rid of the
warning and to prepare for the eventual removal of the operator,
implement our own needs in a lessThan() function.
The function is based on the description of
QSortFilterProxyModel::lessThan().
Fixes #77