From 7680893501a402fb218499b337f52151f8ad502d Mon Sep 17 00:00:00 2001
From: Malo <57839069+MDLC01@users.noreply.github.com>
Date: Fri, 28 Feb 2025 23:53:55 +0100
Subject: [PATCH 1/4] Do not force `math.mid` elements to be Large

---
 crates/typst-layout/src/math/lr.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crates/typst-layout/src/math/lr.rs b/crates/typst-layout/src/math/lr.rs
index bf8235411..5a95ba08f 100644
--- a/crates/typst-layout/src/math/lr.rs
+++ b/crates/typst-layout/src/math/lr.rs
@@ -58,7 +58,7 @@ pub fn layout_lr(
         if let MathFragment::Variant(ref mut variant) = fragment {
             if variant.mid_stretched == Some(false) {
                 variant.mid_stretched = Some(true);
-                scale(ctx, styles, fragment, relative_to, height, Some(MathClass::Large));
+                scale(ctx, styles, fragment, relative_to, height, None);
             }
         }
     }

From 12f33697ceb314ccf197138aa01d19356f7a1ae1 Mon Sep 17 00:00:00 2001
From: Malo <57839069+MDLC01@users.noreply.github.com>
Date: Fri, 28 Feb 2025 23:54:12 +0100
Subject: [PATCH 2/4] Update tests

---
 .../ref/math-lr-mid-size-nested-equation.png  | Bin 900 -> 904 bytes
 tests/ref/math-lr-mid-size.png                | Bin 2210 -> 2219 bytes
 tests/ref/math-lr-mid.png                     | Bin 1399 -> 1405 bytes
 3 files changed, 0 insertions(+), 0 deletions(-)

diff --git a/tests/ref/math-lr-mid-size-nested-equation.png b/tests/ref/math-lr-mid-size-nested-equation.png
index df0106689f081bd938addaf1acf938687152625f..d2da1694280a2d03cedf206eab27833c0f402292 100644
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
index 12b4c0868d133a99f8973511888564a83dafb329..888a8f07c451cfc9ceaf40dcf158d42f05a35b8e 100644
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..5db23a42d828172254d33da5554d9193203fa2fb 100644
GIT binary patch
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z3_$4w6+Ax;XKiLPkPsP}g>XsO%8ZOm1R!m`3NDyw!ULIR7N}s7m*^PubW4&^!!(>=
m&^yuKJ(zo8FYJZ?$MD~3^$@tyv`IDq0000<MNUMnLSTY#zoBFR


From 1025419b5a42774a5342e6079c6bffdfb90a52f0 Mon Sep 17 00:00:00 2001
From: Malo <57839069+MDLC01@users.noreply.github.com>
Date: Fri, 28 Feb 2025 23:54:28 +0100
Subject: [PATCH 3/4] Add test

---
 tests/ref/math-lr-mid-class.png | Bin 0 -> 839 bytes
 tests/suite/math/delimited.typ  |  13 +++++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 tests/ref/math-lr-mid-class.png

diff --git a/tests/ref/math-lr-mid-class.png b/tests/ref/math-lr-mid-class.png
new file mode 100644
index 0000000000000000000000000000000000000000..919e5f26ce86e9e8d1a735cdaed7f9233c2b549e
GIT binary patch
literal 839
zcmeAS@N?(olHy`uVBq!ia0vp^6+nEK14uB0-g_C$z`)Gs>EaktaqI1!^WGwfGRHsu
zo1GWSobT8oA}A6#-RPzl*Q#!p0B_eWg^(!{-EY%USMClB(~_S0jX6j2Qby9*E`{RY
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literal 0
HcmV?d00001

diff --git a/tests/suite/math/delimited.typ b/tests/suite/math/delimited.typ
index 794ffd8aa..de0ce84c1 100644
--- a/tests/suite/math/delimited.typ
+++ b/tests/suite/math/delimited.typ
@@ -77,6 +77,19 @@ $ lr(body) quad
   lr(size: #1em, body) quad
   lr(size: #(1em+20%), body) $
 
+--- math-lr-mid-class ---
+// Test that `mid` keeps the original class.
+$ (a |b) $
+$ (a mid(|)b) $
+--
+$ (a class("fence", |)b) $
+$ (a mid(class("fence", |))b) $
+$ (a class("fence", mid(|))b) $
+--
+$ (a class("binary", |)b) $
+$ (a mid(class("binary", |))b) $
+$ (a class("binary", mid(|))b) $
+
 --- math-lr-unbalanced ---
 // Test unbalanced delimiters.
 $ 1/(2 (x) $

From 337080445f2e754f3d8273c38e7a0fd3e38d7ea0 Mon Sep 17 00:00:00 2001
From: Malo <57839069+MDLC01@users.noreply.github.com>
Date: Wed, 5 Mar 2025 19:00:54 +0100
Subject: [PATCH 4/4] Default to Relation instead of Fence

---
 crates/typst-layout/src/math/lr.rs |  71 ++++++++++++++++++++---------
 tests/ref/math-lr-mid-class.png    | Bin 839 -> 406 bytes
 tests/suite/math/delimited.typ     |  15 ++----
 3 files changed, 54 insertions(+), 32 deletions(-)

diff --git a/crates/typst-layout/src/math/lr.rs b/crates/typst-layout/src/math/lr.rs
index 5a95ba08f..2234e3589 100644
--- a/crates/typst-layout/src/math/lr.rs
+++ b/crates/typst-layout/src/math/lr.rs
@@ -45,12 +45,26 @@ pub fn layout_lr(
 
     // Scale up fragments at both ends.
     match inner_fragments {
-        [one] => scale(ctx, styles, one, relative_to, height, None),
+        [one] => scale_if_delimiter(ctx, styles, one, relative_to, height, None),
         [first, .., last] => {
-            scale(ctx, styles, first, relative_to, height, Some(MathClass::Opening));
-            scale(ctx, styles, last, relative_to, height, Some(MathClass::Closing));
+            scale_if_delimiter(
+                ctx,
+                styles,
+                first,
+                relative_to,
+                height,
+                Some(MathClass::Opening),
+            );
+            scale_if_delimiter(
+                ctx,
+                styles,
+                last,
+                relative_to,
+                height,
+                Some(MathClass::Closing),
+            );
         }
-        _ => {}
+        [] => {}
     }
 
     // Handle MathFragment::Variant fragments that should be scaled up.
@@ -58,7 +72,7 @@ pub fn layout_lr(
         if let MathFragment::Variant(ref mut variant) = fragment {
             if variant.mid_stretched == Some(false) {
                 variant.mid_stretched = Some(true);
-                scale(ctx, styles, fragment, relative_to, height, None);
+                scale(ctx, styles, fragment, relative_to, height);
             }
         }
     }
@@ -99,12 +113,12 @@ pub fn layout_mid(
             MathFragment::Glyph(glyph) => {
                 let mut new = glyph.clone().into_variant();
                 new.mid_stretched = Some(false);
-                new.class = MathClass::Fence;
+                new.class = MathClass::Relation;
                 *fragment = MathFragment::Variant(new);
             }
             MathFragment::Variant(variant) => {
                 variant.mid_stretched = Some(false);
-                variant.class = MathClass::Fence;
+                variant.class = MathClass::Relation;
             }
             _ => {}
         }
@@ -114,8 +128,12 @@ 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,
     styles: StyleChain,
     fragment: &mut MathFragment,
@@ -127,21 +145,32 @@ 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,
-            styles,
-            fragment,
-            Some(Axis::Y),
-            Some(relative_to),
-            height,
-            short_fall,
-        );
+        scale(ctx, styles, 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,
+    styles: StyleChain,
+    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,
+        styles,
+        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
index 919e5f26ce86e9e8d1a735cdaed7f9233c2b549e..0c5269c5ea8b07acc3c2876e937f71f191d2aacf 100644
GIT binary patch
delta 393
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z78{eGKcFE9gm4In8Uhi)TM!Oe&(NMcf`WnwA`6Ew8lwV3GimB2y`JCT4evqwy$zi+
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n`~d-QZMoF~3oP*efPVn>8a4qf)P+v~0000<MNUMnLIPldoY1m5

delta 829
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zd^@v;kMkffY_I7AZ}vHBWP17vhyfHipZ`NWI@rZ-k9PkeP(JZ=^>bP0l+XkK{icNj

diff --git a/tests/suite/math/delimited.typ b/tests/suite/math/delimited.typ
index de0ce84c1..8431f25d0 100644
--- a/tests/suite/math/delimited.typ
+++ b/tests/suite/math/delimited.typ
@@ -78,17 +78,10 @@ $ lr(body) quad
   lr(size: #(1em+20%), body) $
 
 --- math-lr-mid-class ---
-// Test that `mid` keeps the original class.
-$ (a |b) $
-$ (a mid(|)b) $
---
-$ (a class("fence", |)b) $
-$ (a mid(class("fence", |))b) $
-$ (a class("fence", mid(|))b) $
---
-$ (a class("binary", |)b) $
-$ (a mid(class("binary", |))b) $
-$ (a class("binary", mid(|))b) $
+// Test that `mid` creates a Relation, but that can be overridden.
+$ (a | b) $
+$ (a mid(|) b) $
+$ (a class("unary", |) b) $
 
 --- math-lr-unbalanced ---
 // Test unbalanced delimiters.