heading-family should also default to mainfont

fixes #13474

Author: gordonwoodhull

news/changelog-1.9.md

@@ -25,6 +25,7 @@ All changes included in 1.9:
 
 - ([#13362](https://github.com/quarto-dev/quarto-cli/issues/13362)): Remove unused `blockquote` definitions from template.
 - ([#13452](https://github.com/quarto-dev/quarto-cli/issues/13452)): Wraps subfigure captions generated by `quarto_super()` in `block` function to avoid emitting `par` elements. (author: @christopherkenny)
+- ([#13474](https://github.com/quarto-dev/quarto-cli/issues/13474)): Heading font for title should default to `mainfont`.
 
 ## `publish`
 

src/resources/formats/typst/pandoc/quarto/typst-show.typ

@@ -42,6 +42,8 @@ $endif$
 $if(title)$
 $if(brand.typography.headings.family)$
   heading-family: $brand.typography.headings.family$,
+$elseif(mainfont)$
+  heading-family: ("$mainfont$",),
 $endif$
 $if(brand.typography.headings.weight)$
   heading-weight: $brand.typography.headings.weight$,

tests/docs/smoke-all/typst/brand-yaml/typography/basefont-typst.qmd

@@ -0,0 +1,22 @@
+---
+title: "Header logic"
+format:
+  typst:
+    keep-typ: true
+brand:
+  typography:
+    base:
+      family: Comic Sans MS
+_quarto:
+  tests:
+    typst:
+      ensureTypstFileRegexMatches:
+      -
+        - 'heading-family: \("Comic Sans MS",\)'
+---
+
+Some text.
+
+# Header logic so we have the same letters
+
+More text.

tests/docs/smoke-all/typst/brand-yaml/typography/mainfont-typst.qmd

@@ -0,0 +1,19 @@
+---
+title: "Header logic"
+format:
+  typst:
+    keep-typ: true
+mainfont: Comic Sans MS
+_quarto:
+  tests:
+    typst:
+      ensureTypstFileRegexMatches:
+      -
+        - 'heading-family: \("Comic Sans MS",\)'
+---
+
+Some text.
+
+# Header logic so we have the same letters
+
+More text.