Using `\linewidth` instead when converting img/table to latex

[zwz]

Describe your proposed improvement and the problem it solves.
When converting img/table with percentage width (in html) to latex, pandoc uses \textwidth or \columnwidth now, like

\includegraphics[width=0.4908\textwidth]{test.png}
\begin{longtable}[]{@{}
  >{\centering\arraybackslash}p{(\columnwidth - 4\tabcolsep) * \real{0.3333}}
  >{\centering\arraybackslash}p{(\columnwidth - 4\tabcolsep) * \real{0.3333}}
  >{\centering\arraybackslash}p{(\columnwidth - 4\tabcolsep) * \real{0.3333}}@{}}
...

It works perfect for most cases.
But when the img/table is in enumerate environment with items indented, it stretches out at the left side,
makes the text in the environment not so fluent and beautiful.

I googled and according to

1. https://tex.stackexchange.com/questions/16942/difference-between-textwidth-linewidth-and-hsize
2. https://tex.stackexchange.com/questions/124323/tabularx-within-the-enumerate-environment
3. https://tex.stackexchange.com/questions/250662/width-of-minipages-inside-enumerate-environments

it seems a good idea to use \linewidth instead.

[jgm]

Similar issues:
(for images) #9396
(for figures) #9268

Also relevant:
#9268

[jgm]

Current uses of \textwidth:

Image: https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX.hs#L1071
https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX.hs#L1079

Column divs: https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX/Util.hs#L238

Current uses of \colwidth:
Table:
https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX/Table.hs#L152
https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX/Table.hs#L152

Current uses of \linewidth:
Hrule: https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX.hs#L592
Subfigure: https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX.hs#L639
Minipage in table cell: https://github.com/jgm/pandoc/blob/main/src/Text/Pandoc/Writers/LaTeX/Table.hs#L338
Image rescaling in template:
https://github.com/jgm/pandoc/blob/main/data/templates/default.latex#L302
CSL: https://github.com/jgm/pandoc/blob/main/data/templates/default.latex#L414
CSL: https://github.com/jgm/pandoc/blob/main/data/templates/default.latex#L416