Overfull \hbox warning when using footnote in preprint

[mknote88]

When I insert a footnote using preprint style, I get an Overfull \hbox warning upon compiling despite the footnote not being anywhere close to long enough to cause an overfull hbox. Here's a MWE showing the issue:

\documentclass[preprint]{aastex63}

\begin{document}

\footnote{Some text to showcase the problem.}

\end{document}

It appears to be an issue with preprint specifically (and perhaps other styles, though I haven't tested them), and if I instead use the twocolumn style and change nothing else in the above MWE, no warning is given on compiling.

[augustfly]

Thank you! Confirmed and repeatable. Also repeatable for preprint2, so it is related to the internal macro, iftwocolstyle. Maybe related to the hsize hack here:

AASTeX60/cls/aastex63.cls

Lines 760 to 767 in 3a75b16

	\long\def\ltx@foottext#1#2{%
	\begingroup
	\expandafter\ltx@make@current@footnote\expandafter{\@mpfn}{#1}%
	\@footnotetext{\vtop{\iftwocolstyle\hsize=.5\textwidth
	\advance\hsize-18pt
	\fi #2\vskip2pt}}% fixed for two col style, march 15, 2019
	\endgroup
	}%

[CastleStar14654]

@augustfly
Hi, I do not know whether this issue is resolved in the unreleased 6.4 version, since there is no further commits to the github repository. Here is a workaround for those using v6.3.1 using etoolbox:

% in preamble: \usepackage{etoolbox}
\makeatletter
\patchcmd{\ltx@foottext}{%
  .5\textwidth\advance\hsize-18pt}{%
  \linewidth\advance\hsize-1.8em%
}{}{}
\makeatother

This solves two problems:

1. the total horizontal size of the footnote should be the \columnwidth (or \linewidth)
2. the horizontal size of the footnote mark should be 1.8em so that it could work for 12pt manuscript too.