which simplifies O[U]String expressions like A = A + foo into A += foo mostly because then they get spotted by other string plugins. Change-Id: I2b81b701144acdf18743b52cb0befa7f90fd9528 Reviewed-on: https://gerrit.libreoffice.org/c/core/+/194191 Tested-by: Jenkins Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>