rustdoc-search: disambiguate generics

This cleans up the Simd page. It should be sufficient, even though
it can wind up showing more than necessary, but allows each item
to be considered in isolation.

Author: notriddle

src/librustdoc/html/static/js/search.js

@@ -1268,7 +1268,10 @@ function initSearch(rawSearchIndex) {
                         }
                     } else {
                         push(fnType.name, fnType.highlighted);
-                        if (fnType.generics && fnType.generics.some(isTransitivelyHighlighted)) {
+                        if (fnType.generics && fnType.generics.length > 0 &&
+                            (fnType.generics.some(isTransitivelyHighlighted)
+                                || row.implDisambiguator !== null)
+                        ) {
                             pushNotHighlighted("<");
                             formatTypeList(fnType.generics, ", ");
                             pushNotHighlighted(">");

tests/rustdoc-js/search-method-disambiguate.js

@@ -11,7 +11,8 @@ const EXPECTED = [
             {
                 'path': 'search_method_disambiguate::MyTy',
                 'name': 'my_method',
-                'href': '../search_method_disambiguate/struct.MyTy.html#impl-X-for-MyTy%3Cbool%3E/method.my_method'
+                'href': '../search_method_disambiguate/struct.MyTy.html#impl-X-for-MyTy%3Cbool%3E/method.my_method',
+                'displayTypeSignature': '*MyTy*<bool> -> *bool*',
             },
         ],
     },
@@ -21,7 +22,8 @@ const EXPECTED = [
             {
                 'path': 'search_method_disambiguate::MyTy',
                 'name': 'my_method',
-                'href': '../search_method_disambiguate/struct.MyTy.html#impl-X-for-MyTy%3Cu8%3E/method.my_method'
+                'href': '../search_method_disambiguate/struct.MyTy.html#impl-X-for-MyTy%3Cu8%3E/method.my_method',
+                'displayTypeSignature': '*MyTy*<u8> -> *u8*',
             },
         ],
     }