Fix bottom accent positioning in math (#6187)

1 files changed, 13 insertions, 0 deletions

diff --git a/crates/typst-library/src/math/accent.rs b/crates/typst-library/src/math/accent.rs
index e62b6387..f2c9168c 100644
--- a/crates/typst-library/src/math/accent.rs
+++ b/crates/typst-library/src/math/accent.rs
@@ -80,6 +80,19 @@ impl Accent {
     pub fn new(c: char) -> Self {
         Self(Self::combine(c).unwrap_or(c))
     }
+
+    /// List of bottom accents. Currently just a list of ones included in the
+    /// Unicode math class document.
+    const BOTTOM: &[char] = &[
+        '\u{0323}', '\u{032C}', '\u{032D}', '\u{032E}', '\u{032F}', '\u{0330}',
+        '\u{0331}', '\u{0332}', '\u{0333}', '\u{033A}', '\u{20E8}', '\u{20EC}',
+        '\u{20ED}', '\u{20EE}', '\u{20EF}',
+    ];
+
+    /// Whether this accent is a bottom accent or not.
+    pub fn is_bottom(&self) -> bool {
+        Self::BOTTOM.contains(&self.0)
+    }
 }
 
 /// This macro generates accent-related functions.