[PUSHED] Replace chained O(U)StringBuffer::append() with operator+

[Fridrich Strba (via Code Review)]

Hi,

Thank you for your patch!  It has been merged to LibreOffice.

If you are interested in details, please visit

    https://gerrit.libreoffice.org/3546

Approvals:
  Thomas Arnhold: Verified; Looks good to me, but someone else must approve
  Fridrich Strba: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I681188553058ac8712365bc2de39b0453fd19ed9
Gerrit-PatchSet: 2
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Anurag Kanungo <anuragkanungo at gmail.com>
Gerrit-Reviewer: Fridrich Strba <fridrich at documentfoundation.org>
Gerrit-Reviewer: Thomas Arnhold <thomas at arnhold.org>