`.landscape` does not keep page size for Word (enforce "A4" in landscape whilst default doc is US Letter)

I don't think there an easy or even a fix for this at least not by simply injecting OpenXML code.

Using the landscape shortcode for Word document will also have another issue: the page/section dimension might me different to the portrait page/section because the dimension is hardcoded in the shortcode.

In OpenXML, a new section has to contains height, width, etc. and as far as I know don't inherits elements, thus since footer is not defined in the section, it's not there in the end.

For instance, here is what the community contributed landscapes shortcode does for Word:

• https://github.com/quarto-dev/quarto-cli/blob/d4125e43f499002d1a3e488c3aefa5d24fe17412/src/resources/filters/quarto-post/landscape.lua#L11-L23

Originally posted by @mcanouil in #12628

Start with the linked src/resources/filters/quarto-post/landscape.lua implementation and reproduce a Word document whose default page size is US Letter before applying the landscape shortcode. Inspect the generated section properties and footer behavior in the OpenXML output. Done means landscape preserves the intended page size and required section content without hardcoding A4.