tdf#111964: only trim XML whitespace

OUString::trim() uses rtl_uString_newTrim, which relies upon
rtl_ImplIsWhitespace. The latter treats as whitespaces not only
characters with values less than or equal to 32, but also Unicode
General Punctuation area Space and some Control characters. Thus,
using OUString::trim() is incorrect when the goal is to trim XML
whitespace, which is defined as one of 0x09, 0x0A, 0x0D, 0x20.

The comments for OUString::trim() and rtl_uString_newTrim are
corrected to describe which characters are considered whitespace.

A unit test included.

Change-Id: I45a132be923a52dcd5a4c35aeecb53d423b49fec
Reviewed-on: https://gerrit.libreoffice.org/41444
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>
(cherry picked from commit 5b518ab051cc04e672ceb01da42b06625a1a4ce9)
Reviewed-on: https://gerrit.libreoffice.org/44758
Reviewed-by: Aron Budea <aron.budea@collabora.com>
Tested-by: Aron Budea <aron.budea@collabora.com>

0 files changed, 0 insertions, 0 deletions