docs: number-offset is HTML only option

[mcanouil]

This PR updates the reference options for. number-offset which is an HTML only option.

Related to #6842.
Until Pandoc uses the option on other formats, it is better to not wrongly display it in all formats.

[cderv]

@mcanouil I believe we are supposed to handle number-offset directly in Quarto through Lua, and this is part of Crossref feature.

quarto-cli/src/command/render/crossref.ts

Line 37 in 8da91de

const kCrossrefFilterParams = [kListings, kNumberSections, kNumberOffset];

quarto-cli/src/resources/filters/crossref/index.lua

Line 9 in 8da91de

local numberOffset = pandoc.List(param("number-offset", {}))

quarto-cli/src/resources/filters/crossref/index.lua

Lines 175 to 187 in 8da91de

	-- chapter entry
	if refType(chapterId) == "sec" and param("number-offset") ~= nil then
	local chapterEntry = {
	key = chapterId,
	parent = nil,
	order = {
	number = 1,
	section = crossref.index.numberOffset
	}
	}
	index.entries:insert(chapterEntry)
	end
	end

This could be look for commit history to understand the background.

That would be worth looking why this is does not work anymore as it should have been. It seems deeper than just a documentation change.

Or maybe it has never worked... 🤷‍♂️ Would be worth looking in the history

We do have a Lua filter for this numbering feature in R Markdown (https://github.com/rstudio/rmarkdown/blob/main/inst/rmarkdown/lua/number-sections.lua) so I would assume this would have been ported over

Anyhow, worth looking deeper (Did not do it, just sharing this info for now)

[mcanouil]

Thanks @cderv I tried few versions of Quarto and if it ever worked it was a long time ago^^

[cderv]

Ok thanks for trying. Then the question should be raised in the team discussion for historical behavior. It may has been lost over version because not well tracked, and indeed not Pandoc supported. This would have been an addition from Quarto.

For 1.4 this indeed seems to be a documentation update we need to confirm, and probably worth reinserting the feature properly (or debug) for later. (not sure about the timing).

[mcanouil]

@dragonstyle added the 1.5 milestone to the original issue, thus this PR might only be for 1.4 time being (and possibly at most).

• number-offset in PDF output for Quarto is not working. #6842

Quick note: the few lines from Lua filter here seems to be for PDF books not simple PDF.