https://bugs.documentfoundation.org/show_bug.cgi?id=119087

--- Comment #7 from Regina Henschel <rb.hensc...@t-online.de> ---
(In reply to Ashod Nakashian from comment #6)

> Can you provide more info please? I'm not sure what 'strict mode' is or how
> to set it (in fact I don't have MSO).

The pptx format is specified in ISO/IEC 29500. But Microsoft might add some
extensions to that format (e.g. for compatibility to old ppt format), which are
not specified and are not handled by the extension mechanism provided in the
specification. In MSO you can decide whether to use these extensions or to save
to 'strict' format. The specification describes the conformance classes in ยง2.1
of part 1. The file presentation.xml has in element <p:presentation> the
attribute 'conformance="strict"'. The other attribute value would be
'transitional', which is the default in case the attribute is missing.

 Also, can you provide an example of
> the output you describe in the previous comment regarding the leftover
> please? Perhaps a screenshot between expected and actual?

It is nothing about 'screen', but about the files. The pptx format is a simple
zip-container. So unpack the three attached files. Then open the file
'presentation.xml' from subfolder 'ppt' in a text editor and compare theme. 

> 
> Also, how common is this issue?

I don't know. A private user will usually not use the 'strict' format, because
it is not the default format. I don't know whether there exists enterprises or
authorities that force the use of 'strict' format.

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