review for patch for tdf#127785 Apply 180deg compensation for flipV to text range

[Regina Henschel]

Hi all,

because my first attempt to fix the error was wrong, I have made a new 
proposal in https://gerrit.libreoffice.org/#/c/80310/

To be sure, that it is correct now, it would be nice, if you review the 
patch.
Some comments and test documents are in the bug report. But perhaps you 
know other places, which have to be checked too.

Kind regards
Regina