Fix `math.stretch` not working vertically with attachments (#5069)

1 files changed, 7 insertions, 1 deletions

diff --git a/crates/typst/src/math/stretch.rs b/crates/typst/src/math/stretch.rs
index d316fa9a..232252b9 100644
--- a/crates/typst/src/math/stretch.rs
+++ b/crates/typst/src/math/stretch.rs
@@ -73,9 +73,15 @@ pub(super) fn stretch_fragment(
         _ => return,
     };
 
-    let Some(axis) = axis.or_else(|| stretch_axis(ctx, &glyph)) else {
+    // Return if we attempt to stretch along an axis which isn't stretchable,
+    // so that the original fragment isn't modified.
+    let Some(stretch_axis) = stretch_axis(ctx, &glyph) else {
         return;
     };
+    let axis = axis.unwrap_or(stretch_axis);
+    if axis != stretch_axis {
+        return;
+    }
 
     let relative_to_size = relative_to.unwrap_or_else(|| fragment.size().get(axis));