Method isValid

include/eepp/ui/models/persistentmodelindex.hpp:31–31

	PersistentModelIndex& operator=( PersistentModelIndex&& ) = default;

	bool isValid() const { return hasValidHandle() && mHandle.lock()->mIndex.isValid(); }
	bool hasValidHandle() const { return !mHandle.expired(); }

	int row() const;