Problems with unittest testEffectExtentInline

[Regina Henschel]

Hi Miklos, hi all,

I'm currently working on https://gerrit.libreoffice.org/c/core/+/115668
WIP improve wrap margins in docx filters

My current state is, that distances needed for shadow and glow, for 
rotation and for fat stroke/border are read from docx, and they are 
written to docx from docx and from odt. That works for "normal" cases 
besides +-1Twip rounding errors somewhere and border thickness for 
frames, which is not yet implemented.

But I have trouble with unittest testEffectExtentInline [1]. The 
document in testEffectExtentInline would need a negative bottom margin 
(UI wrap distance from text). But that is not possible in LO, bug 
tdf#141880. The test does not fail in current LO, because it does not 
determine the actual values of the image, but simple writes out the 
values from InteropGrabBag. If the user changes the rotate angle to 
90deg (and put it back to vertical 'top to base line') or sets the 
bottom margin to 1cm for example, the exported docx file has unsuitable 
effectExtent. That results currently in a wrong line height in Word.

I have tried this: Open the test document in Word and change the rotate 
angle to 330° to force Word to recalculate the effectExtent values. Save 
it and reopen it in Word, change back to rotate angle 320° and save that 
again. Then the document has different effectExtent values than the 
original test document. With these values the problem does not exist.

So what to do?

[1] 
https://opengrok.libreoffice.org/xref/core/sw/qa/extras/ooxmlexport/ooxmlexport.cxx?r=1b82b81c&mo=29450&fi=582#591

Kind regards
Regina