Fix spacing after number in math

Fixes #1052

crates/typst-library/src/math/ctx.rs

@@ -190,7 +190,7 @@ impl<'a, 'b, 'v> MathContext<'a, 'b, 'v> {
             } else {
                 glyph.into()
             }
-        } else if text.chars().all(|c| c.is_ascii_digit()) {
+        } else if text.chars().all(|c| c.is_ascii_digit() || c == '.') {
             // Numbers aren't that difficult.
             let mut fragments = vec![];
             for c in text.chars() {

tests/typ/bugs/math-number-spacing.typ

@@ -0,0 +1,9 @@
+// Test spacing after numbers in math.
+
+---
+$
+10degree \
+10 degree \
+10.1degree \
+10.1 degree
+$