From f7bd03dd76533cda2d2626d6470d3bb55e03b012 Mon Sep 17 00:00:00 2001
From: Ian Wrzesinski <133046678+wrzian@users.noreply.github.com>
Date: Thu, 23 Jan 2025 07:27:38 -0500
Subject: Fix delimiter unparen syntax (#5739)

---
 crates/typst-syntax/src/parser.rs |   4 ++--
 tests/ref/math-lr-unparen.png     | Bin 0 -> 493 bytes
 tests/suite/math/delimited.typ    |   8 ++++++++
 3 files changed, 10 insertions(+), 2 deletions(-)
 create mode 100644 tests/ref/math-lr-unparen.png

diff --git a/crates/typst-syntax/src/parser.rs b/crates/typst-syntax/src/parser.rs
index a65e5ff6..f9fb8b61 100644
--- a/crates/typst-syntax/src/parser.rs
+++ b/crates/typst-syntax/src/parser.rs
@@ -442,10 +442,10 @@ fn math_unparen(p: &mut Parser, m: Marker) {
         if first.text() == "(" && last.text() == ")" {
             first.convert_to_kind(SyntaxKind::LeftParen);
             last.convert_to_kind(SyntaxKind::RightParen);
+            // Only convert if we did have regular parens.
+            node.convert_to_kind(SyntaxKind::Math);
         }
     }
-
-    node.convert_to_kind(SyntaxKind::Math);
 }
 
 /// The unicode math class of a string. Only returns `Some` if `text` has
diff --git a/tests/ref/math-lr-unparen.png b/tests/ref/math-lr-unparen.png
new file mode 100644
index 00000000..d418b14e
Binary files /dev/null and b/tests/ref/math-lr-unparen.png differ
diff --git a/tests/suite/math/delimited.typ b/tests/suite/math/delimited.typ
index 22674050..ca82427d 100644
--- a/tests/suite/math/delimited.typ
+++ b/tests/suite/math/delimited.typ
@@ -125,3 +125,11 @@ $ lr(size: #3em, |)_a^b lr(size: #3em, zws|)_a^b
 --- issue-4188-lr-corner-brackets ---
 // Test positioning of U+231C to U+231F
 $⌜a⌟⌞b⌝$ = $⌜$$a$$⌟$$⌞$$b$$⌝$
+
+--- math-lr-unparen ---
+// Test that unparen with brackets stays as an LrElem.
+#let item = $limits(sum)_i$
+$
+  1 / ([item]) quad
+  1 /  [item]
+$
-- 
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