Show exact case-sensitive matches first

See rust-lang/rust#129430

Author: Folyd

lib/search/docs/base-v2.js

@@ -2089,6 +2089,7 @@ export default class DocSearchV2 {
          */
         const sortResults = async (results, isType, preferredCrate) => {
             const userQuery = parsedQuery.userQuery;
+            const casedUserQuery = parsedQuery.original;
             const result_list = [];
             for (const result of results.values()) {
                 result.item = this.searchIndex[result.id];
@@ -2099,6 +2100,13 @@ export default class DocSearchV2 {
             result_list.sort((aaa, bbb) => {
                 let a, b;
 
+                // sort by exact case-sensitive match
+                a = (aaa.item.name !== casedUserQuery);
+                b = (bbb.item.name !== casedUserQuery);
+                if (a !== b) {
+                    return a - b;
+                }
+
                 // sort by exact match with regard to the last word (mismatch goes later)
                 a = (aaa.word !== userQuery);
                 b = (bbb.word !== userQuery);