The declaration of insert(it, n, t) used qsizetype for n, while the
definition used size_type. That works by chance, because the size_type
typedef comes only after the insert(it, n, t) declaration. It was
detected when size_type became a typedef in a base class of
QVarLengthArray in my local branch.
Just use the same type name in the implementation as in the
declaration.
In 5.15, the same issue exists (with s/qsizetype/int/).
Pick-to: 6.2 5.15
Change-Id: I64235eeaeaed3d43f4c070ca536474fae94c1b5d
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>