Compare latex fragment properties.

src/compare/diff.rs

@@ -3185,10 +3185,21 @@ fn compare_latex_fragment<'b, 's>(
     emacs: &'b Token<'s>,
     rust: &'b LatexFragment<'s>,
 ) -> Result<DiffEntry<'b, 's>, Box<dyn std::error::Error>> {
-    let this_status = DiffStatus::Good;
-    let message = None;
+    let mut this_status = DiffStatus::Good;
+    let mut message = None;
 
-    // TODO: Compare :value
+    if let Some((new_status, new_message)) = compare_properties!(
+        emacs,
+        rust,
+        (
+            EmacsField::Required(":value"),
+            |r| Some(r.value),
+            compare_property_quoted_string
+        )
+    )? {
+        this_status = new_status;
+        message = new_message;
+    }
 
     Ok(DiffResult {
         status: this_status,