Spacing too short between a bibliography and a subsequent heading in PDF output (with a solution/workaround)

Spacing too short between a bibliography and a subsequent heading in PDF output (with a solution/workaround)

[Bastien DUMONT]

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With the attached file test-biblio-header-spacing.md and the default LaTeX template, I observed that the space between the bibliography and the subsequent heading is too short in PDF output (see bad.pdf). This comes from the l. 381 in the default template that implements the hanging indentation in the CSLReferences environment:

   \ifodd #1 \everypar{\setlength{\hangindent}{\cslhangindent}}\ignorespaces\fi

I have not been able to tweak \everypar so that I could, for instance, revert it to its former definition at the end of the environment. Instead, as \hangindent needs to be reset at every paragraph and bibliographical items are always preceded by the \leavevmode command, I achieved the same result by redefining \leavevmode without interfering with the spacing at the end of the bibliography (see custom-template.latex and good.pdf):

   \ifodd #1
   \edef\leavevmodesave{\leavevmode}
   \def\leavevmode{\leavevmodesave\setlength{\hangindent}{\cslhangindent}}
   \fi

(Notice that I removed \ignorespaces here: since we are at the beginning of a paragraph, I suspect it is not relevant. But I may be mistaken.)

However I have only vague ideas about TeX. Although I haven't noticed any side effect, I fear that I have missed something, or that a cleaner solution exists. Has anyone a better insight?

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---
title: My lesson
lang: en
references:
- type: article-journal
  id: first
  title: A first reference whith a long title to show the hanging indent
  author:
  - family: Firstauthor
    given: Hername
  container-title: A rather long journal title
  issue: 200
  issued: 2020
- type: article-journal
  id: second
  title: A second, newer reference whith a long title to show the hanging indent
  author:
  - family: Secondauthor
    given: Hisname
  container-title: A rather long journal title
  issue: 201
  issued: 2021
---

# Mandatory readings

:::{#refs}
:::

# Introduction

Before reading this, please see the abovementionned papers. These are very important for the purpose of this lesson.

# Basics

So you read the articles, right? Let's expose the basics first, and then we will be able to elaborate on it.

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