Beamer+columns+footnotes can be improved

[ashwinvis]

Footnotes within columns distort the output.

Input

# A slide

::::::::::::::::::::{.columns}
:::{.column width=50%}

contents[^1]

:::
:::{.column width=50%}

more contents^[another footnote]

:::
:::::::::::::::::::::

[^1]: A footnote

Commands

❯ pandoc --version                                                                                                                                                                        
pandoc 2.7.3
Compiled with pandoc-types 1.17.5.4, texmath 0.11.2.2, skylighting 0.8.1
Default user data directory: /home/avmo/.local/share/pandoc or /home/avmo/.pandoc
❯ cat slides.md
❯ pandoc -t beamer -s slides.md -o slides.tex 
❯ latexmk -pdf slides.tex

The solution

As suggested here https://tex.stackexchange.com/a/86757 would be to use \footnote<.->[frame]{some text}. I believe it goes here:

pandoc/src/Text/Pandoc/Writers/LaTeX.hs

Lines 1323 to 1325 in 1138d5b

	let beamerMark = if beamer
	then text "<.->"
	else empty

[ashwinvis]

How it works now

After manually editing the tex file

[jpcirrus]

Having footnotes appear at the bottom of their respective columns is inconsistent with how footnotes work when the content is not in columns, where the footnote is always at the bottom of the frame. The solution as proposed in #5769 (comment) is the correct one according to section 12.12 of the Beamer manual, ensuring footnotes will always appear at the bottom of their frame.

[jgm]

Such an easy fix! Sorry it took so long.