Remove all whitespace from search option if it contains any line breaks and handle triple+ slashes for file links.

src/compare/diff.rs

@@ -3044,7 +3044,7 @@ fn compare_angle_link<'b, 's>(
         ),
         (
             EmacsField::Required(":search-option"),
-            |r| r.search_option,
+            |r| r.get_search_option(),
             compare_property_quoted_string
         )
     )? {