Test the latex.before-metadata option

Author: tarleb

example/paper.md

@@ -462,3 +462,14 @@ A common method for PDF generation is to go via LaTeX. However, support
 for tagging -- a requirement for accessible PDFs -- is not readily
 available for LaTeX. The current method used ConTeXt, to produce tagged
 PDF/A-3, a format suited for archiving [@pdfa3].
+
+
+``` {=comment}
+The below snippet can be added to the YAML metadata if the placement of
+the metadata block in the margin needs manual adjustments.
+```
+
+---
+latex:
+  before-metadata: '`\vspace{0cm}`{=latex}'
+---

test/expected-draft/paper.tex

@@ -406,6 +406,7 @@
 \marginpar{
 
   \begin{flushleft}
+  \vspace{0cm}
   %\hrule
   \sffamily\small
 

test/expected-pub/paper.tex

@@ -403,6 +403,7 @@
 \marginpar{
 
   \begin{flushleft}
+  \vspace{0cm}
   %\hrule
   \sffamily\small