Shapes in RTL sheets

[Regina Henschel]

Hi all,

since no one answered my question about what behavior is desirable for 
shapes on right-to-left sheets, I have now implemented it according to 
my ideas:
On saving and loading the shapes are shifted between positive and 
negative part of the draw page regardless of anchoring type. It fixes 
bugs tdf#137081 and tdf#137082.
If a user switches from LTR to RTL or back, currently page anchored 
shapes are mirrored, but cell anchored not. I have changed it so, that 
ordinary shapes are always mirrored. That way an arrow pointing from 
cell A2 to C4 keeps pointing from A2 to C4, for example. I have kept, 
that graphics, media and OLE-objects are not mirrored.

You find my patch in https://gerrit.libreoffice.org/c/core/+/109959

Please tell me, if you have any concerns. Otherwise I will submit it.

Kind regards
Regina