Use the std-compatible API subset instead.
This is in preparation of using QVarLengthArray instead of QList here,
which (thankfully, because it's inefficient for arbitray T) doesn't
have pop_front().
As a drive-by, port at(0) to front() and introduce a temporary
variable. The front() call will briefly emit a detach attempt (but the
container isn't shared, so it won't actually detach), but only until
the next patch ports to QVLA.
Change-Id: I38ee123aa6730aee5ba1e14ec46fc71c5d74986e
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
0756b6a719