where at restoring the SaveIndex the underlying aLine string had
been replaced, so the index is for a different string. Save and
restore the aLine too. Not entirely sure this is what we want,
but it does seem to be what this restoring code expects.
Change-Id: I25bd02fad72d9b0729b9504fe04416340d0e070a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/136286
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>