Created attachment 157413 [details]
sample file

Found while investigating bug 129685

Steps to reproduce:
1. Open attached document

-> Text in all shapes is centered. it should be aligned to the left. See comparison image

I think the problem is in https://opengrok.libreoffice.org/xref/core/oox/source/drawingml/textbodypropertiescontext.cxx?r=a7f28581#80

something like this fixes the issue

    const OptValue<bool> bAnchorCtr = rAttribs.getBool( XML_anchorCtr );
    if( bAnchorCtr.has() )
    {
        mrTextBodyProp.mbAnchorCtr = bAnchorCtr.get();
        if( mrTextBodyProp.mbAnchorCtr )
            mrTextBodyProp.maPropertyMap.setProperty( PROP_TextHorizontalAdjust, TextHorizontalAdjust_CENTER );
        else
            mrTextBodyProp.maPropertyMap.setProperty( PROP_TextHorizontalAdjust, TextHorizontalAdjust_LEFT );
    }

however, it makes test sd/qa/unit/data/n819614.pptx to fail as text is left aligned, while it should be centered

Reproduced in

Version: 7.0.0.0.alpha0+
Build ID: 6b4fe3e44b4daa89fef6a3385919b00472eaed60
CPU threads: 4; OS: Linux 4.19; UI render: default; VCL: gtk3; 
Locale: en-US (en_US.UTF-8); UI-Language: en-US
Calc: threaded