From 3a6d5fd6b21c85fa100d7fc1e7508ee4b484d99c Mon Sep 17 00:00:00 2001
From: Malo <57839069+MDLC01@users.noreply.github.com>
Date: Wed, 11 Jun 2025 09:29:38 +0100
Subject: [PATCH] Do not force `math.mid` elements to have the Large math class
 (#5980)

---
 crates/typst-layout/src/math/lr.rs            |  45 ++++++++++--------
 tests/ref/math-lr-mid-class.png               | Bin 0 -> 556 bytes
 .../ref/math-lr-mid-size-nested-equation.png  | Bin 900 -> 920 bytes
 tests/ref/math-lr-mid-size.png                | Bin 2210 -> 2251 bytes
 tests/ref/math-lr-mid.png                     | Bin 1399 -> 1413 bytes
 tests/suite/math/delimited.typ                |   8 ++++
 6 files changed, 34 insertions(+), 19 deletions(-)
 create mode 100644 tests/ref/math-lr-mid-class.png

diff --git a/crates/typst-layout/src/math/lr.rs b/crates/typst-layout/src/math/lr.rs
index e0caf417..a3b5cb05 100644
--- a/crates/typst-layout/src/math/lr.rs
+++ b/crates/typst-layout/src/math/lr.rs
@@ -45,12 +45,12 @@ pub fn layout_lr(
 
     // Scale up fragments at both ends.
     match inner_fragments {
-        [one] => scale(ctx, one, relative_to, height, None),
+        [one] => scale_if_delimiter(ctx, one, relative_to, height, None),
         [first, .., last] => {
-            scale(ctx, first, relative_to, height, Some(MathClass::Opening));
-            scale(ctx, last, relative_to, height, Some(MathClass::Closing));
+            scale_if_delimiter(ctx, first, relative_to, height, Some(MathClass::Opening));
+            scale_if_delimiter(ctx, last, relative_to, height, Some(MathClass::Closing));
         }
-        _ => {}
+        [] => {}
     }
 
     // Handle MathFragment::Glyph fragments that should be scaled up.
@@ -58,7 +58,7 @@ pub fn layout_lr(
         if let MathFragment::Glyph(ref mut glyph) = fragment {
             if glyph.mid_stretched == Some(false) {
                 glyph.mid_stretched = Some(true);
-                scale(ctx, fragment, relative_to, height, Some(MathClass::Large));
+                scale(ctx, fragment, relative_to, height);
             }
         }
     }
@@ -97,7 +97,7 @@ pub fn layout_mid(
     for fragment in &mut fragments {
         if let MathFragment::Glyph(ref mut glyph) = fragment {
             glyph.mid_stretched = Some(false);
-            glyph.class = MathClass::Fence;
+            glyph.class = MathClass::Relation;
         }
     }
 
@@ -105,8 +105,12 @@ pub fn layout_mid(
     Ok(())
 }
 
-/// Scale a math fragment to a height.
-fn scale(
+/// Scales a math fragment to a height if it has the class Opening, Closing, or
+/// Fence.
+///
+/// In case `apply` is `Some(class)`, `class` will be applied to the fragment if
+/// it is a delimiter, in a way that cannot be overridden by the user.
+fn scale_if_delimiter(
     ctx: &mut MathContext,
     fragment: &mut MathFragment,
     relative_to: Abs,
@@ -117,20 +121,23 @@ fn scale(
         fragment.class(),
         MathClass::Opening | MathClass::Closing | MathClass::Fence
     ) {
-        // This unwrap doesn't really matter. If it is None, then the fragment
-        // won't be stretchable anyways.
-        let short_fall = DELIM_SHORT_FALL.at(fragment.font_size().unwrap_or_default());
-        stretch_fragment(
-            ctx,
-            fragment,
-            Some(Axis::Y),
-            Some(relative_to),
-            height,
-            short_fall,
-        );
+        scale(ctx, fragment, relative_to, height);
 
         if let Some(class) = apply {
             fragment.set_class(class);
         }
     }
 }
+
+/// Scales a math fragment to a height.
+fn scale(
+    ctx: &mut MathContext,
+    fragment: &mut MathFragment,
+    relative_to: Abs,
+    height: Rel<Abs>,
+) {
+    // This unwrap doesn't really matter. If it is None, then the fragment
+    // won't be stretchable anyways.
+    let short_fall = DELIM_SHORT_FALL.at(fragment.font_size().unwrap_or_default());
+    stretch_fragment(ctx, fragment, Some(Axis::Y), Some(relative_to), height, short_fall);
+}
diff --git a/tests/ref/math-lr-mid-class.png b/tests/ref/math-lr-mid-class.png
new file mode 100644
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diff --git a/tests/ref/math-lr-mid-size-nested-equation.png b/tests/ref/math-lr-mid-size-nested-equation.png
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GIT binary patch
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diff --git a/tests/ref/math-lr-mid-size.png b/tests/ref/math-lr-mid-size.png
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GIT binary patch
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diff --git a/tests/ref/math-lr-mid.png b/tests/ref/math-lr-mid.png
index 42e6da706870bde9c0fa6c7454cf3ab6ff39d929..8af85b0058ecbde7483008a07f04139b8634bd9c 100644
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diff --git a/tests/suite/math/delimited.typ b/tests/suite/math/delimited.typ
index 794ffd8a..b8656151 100644
--- a/tests/suite/math/delimited.typ
+++ b/tests/suite/math/delimited.typ
@@ -77,6 +77,14 @@ $ lr(body) quad
   lr(size: #1em, body) quad
   lr(size: #(1em+20%), body) $
 
+--- math-lr-mid-class ---
+// Test that `mid` creates a Relation, but that can be overridden.
+$ (a | b) $
+$ (a mid(|) b) $
+$ (a class("unary", |) b) $
+$ (a class("unary", mid(|)) b) $
+$ (a mid(class("unary", |)) b) $
+
 --- math-lr-unbalanced ---
 // Test unbalanced delimiters.
 $ 1/(2 (x) $