refactor: only mutating methods on Markdown require mutable self

Use RefCell's interior mutability to work around the fact that
pandoc_ast's MutVisitor requires a mutable reference to self.

Sponsored-by: author

1 files changed, 1 insertions, 1 deletions

diff --git a/src/doc.rs b/src/doc.rs
index a39ab99..e860726 100644
--- a/src/doc.rs
+++ b/src/doc.rs
@@ -105,7 +105,7 @@ impl Document {
         subplot: PathBuf,
         markdowns: Vec<PathBuf>,
         yamlmeta: &YamlMetadata,
-        mut md: Markdown,
+        md: Markdown,
         style: Style,
         template: Option<&str>,
     ) -> Result<Document, SubplotError>