Re: Pandoc #4317 side effect

[Thomas Chevrier <tchevri-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi folks,

it's been exactly a year now and I am still not able to upgrade my version 
of Pandoc - stuck pre 2.7, because of the adverse change.
Indeed, the "upgrade" for reveal.js users caused my latex beamer code to 
break down.
I have tried multiple things without luck - I also tried a lua filter, but 
that did not work - no matter what, the content gets "slapped" onto a slide.
As JGM suggests (was great watching him talk about Pandoc at TUG 2020 
keynote address), I'd love to be able to simply be able to have content 
escape being slapped onto a slide - I believe that's precisely the spirit 
of Beamer, which uses <mode> heavily for that purpose.
I also thought that was the spirit of pandoc - as you were setting in the 
yaml header your level for displaying on slides, but i have been clearly 
proven wrong. :-(
One option would be to recompile pandoc without that change, but because of 
the bloomberg API, I am forced to be on windows, which would make this 
solution cumbersome at best (would be straightforward on linux though).

FYI, I posted back then on SO, got only 2 upvotes and 2 bookmarks, but no 
answer, not even a comment :-(
https://stackoverflow.com/questions/57614387/pandoc-4317-forces-content-under-title-slides-to-be-included-in-a-frame-in-pand
  

Could anyone *please* help me?
many thanks in advance
thomas


On Wednesday, August 28, 2019 at 12:23:15 AM UTC+8 John MacFarlane wrote:

>
> To summarize the issue here, which concerns a change to slide 
> show formats: 
>
> Prior to 2.7, versions of pandoc only put material under the "slide 
> level" headings on slides. If you set slide level to 2, then 
> only material under level-2 headings would appear on slides, 
> and text under level-1 headings would not appear at all 
> (though level-1 headings would create "title slides" with 
> just the section title). 
>
> Reveal.js users consistently complained (#4317, #5237) that 
> this made it hard to structure reveal.js 2D slide shows, in 
> which it is common to have the "top" slide on each column 
> contain both a title and some text. 
>
> In response, I changed pandoc in 2.7 -- as the changelog says, 
>
> > Slide show formats behavior change: content under headers less 
> > than slide level is no longer ignored, but included in the title 
> > slide (for HTML slide shows) or in a slide after the title slide 
> > (for beamer). This change makes possible 2D reveal.js slideshows 
> > with content in the top slide on each stack (#4317, #5237). 
>
> The change to reveal.js has been welcomed by reveal.js users, 
> but the change to beamer is apparently not welcome by everyone. 
> The reason I made the change to both formats is because I want 
> slide shows to work the same no matter what output format you 
> use. (So you can switch from beamer to reveal.js, for example, 
> and the slides will look more or less the same.) 
>
> I had thought the beamer change was innocuous, since it could 
> be worked around by people who wanted to include content under 
> top-level section headings but not in the slides, e.g. by using 
> a filter to strip out this content. 
>
> Unfortunately, Thomas Chevrier's use case can't be handled that 
> way. He wants to insert raw tex commands that (a) can't be 
> stripped out but (b) only work if they're outside the 
> 'frame' environment created for a slide. I can't think of any 
> workaround for this. 
>
> One possible course of action would be to revert the beamer 
> change while keeping the reveal.js change. This would potentially 
> have two bad consequences: 
>
> 1) slide shows would render differently (in content, not just 
> form) in reveal.js and beamer. 
>
> 2) this may break slide shows that were constructed using the 
> new behavior since 2.7 was released. 
>
> A less radical change might be to introduce special Div whose 
> contents get moved outside the slide itself. Anyway, comments 
> welcome. 
>
>
>

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