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It must only add characters up to terminating null, as its counterpart
ToStringHelper< char[ N ] > does, and as its own length implies.
Was this way ever since commit f1769094af
(round out StringConcat helpers with sal_Unicode* overloads, 2019-10-11).
Change-Id: I3e267789333dac23754e67b19ff596ad359868aa
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/187791
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>