Looking for review for patch for tdf#115813

[Regina Henschel]

Hi all,

I'm still working on 
https://bugs.documentfoundation.org/show_bug.cgi?id=115813 Position 
shifted while moving the handle of OOXML Callout shape

My solution is now in https://gerrit.libreoffice.org/#/c/71258/

The patch handles only the case of XY-handles in preset OOXML-shapes. I 
have currently no idea, how to solve the polar-handle cases.

I'm not going to make unit-tests, because it would be a test over 135 cases.

My patch improves the current handling of preset OOXML-shapes. However, 
I am aware that a general solution for all shapes would be much better, 
but so far there hasn't been a brilliant idea for that.

Kind regards
Regina