hoist exact matches to top of autocomplete suggestions

src/jquery.autocomplete.js

@@ -531,8 +531,31 @@
                 })
             };
             
+            function wholeWordMatch(suggestion) {
+                return (suggestion.split(/\b/).indexOf(queryLowerCase) >= 0);
+            }
+
+            function preferExactMatches(a, b) {
+                var sa = a.value.toLowerCase();
+                var aWhole = wholeWordMatch(sa);
+                var sb = b.value.toLowerCase();
+                var bWhole = wholeWordMatch(sb);
+                if (aWhole && bWhole) {
+                    if (sa === queryLowerCase && sb === queryLowerCase) {
+                        return 0;
+                    }
+                    return (sa === queryLowerCase) ? -1 : 1;
+                }
+                if (aWhole) {
+                    return -1;
+                }
+                if (bWhole) {
+                    return 1;
+                }
+                return 0;
+            }
             if (limit && data.suggestions.length > limit) {
-                data.suggestions = data.suggestions.slice(0, limit);
+                data.suggestions = data.suggestions.sort(preferExactMatches).slice(0, limit);
             }
 
             return data;