Rollup merge of #96879 - notriddle:notriddle/search-ranking, r=GuillaumeGomez

rustdoc: search result ranking fix

# Before

![image](https://user-images.githubusercontent.com/1593513/167477286-91049761-67f9-4a73-8fb7-09dbb19ca76c.png)

# After

![image](https://user-images.githubusercontent.com/1593513/167477345-6733bc0f-4bb2-4625-9f7f-094031e36414.png)

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

@@ -1323,7 +1323,6 @@ window.initSearch = rawSearchIndex => {
                 }
             }
             lev = levenshtein(searchWord, elem.pathLast);
-            lev += lev_add;
             if (lev > 0 && elem.pathLast.length > 2 && searchWord.indexOf(elem.pathLast) > -1)
             {
                 if (elem.pathLast.length < 6) {
@@ -1332,6 +1331,7 @@ window.initSearch = rawSearchIndex => {
                     lev = 0;
                 }
             }
+            lev += lev_add;
             if (lev > MAX_LEV_DISTANCE) {
                 return;
             } else if (index !== -1 && elem.fullPath.length < 2) {

src/test/rustdoc-js-std/path-ordering.js

@@ -0,0 +1,12 @@
+const QUERY = 'hashset::insert';
+
+const EXPECTED = {
+    'others': [
+        // ensure hashset::insert comes first
+        { 'path': 'std::collections::hash_set::HashSet', 'name': 'insert' },
+        { 'path': 'std::collections::hash_set::HashSet', 'name': 'get_or_insert' },
+        { 'path': 'std::collections::hash_set::HashSet', 'name': 'get_or_insert_with' },
+        { 'path': 'std::collections::hash_set::HashSet', 'name': 'get_or_insert_owned' },
+        { 'path': 'std::collections::hash_map::HashMap', 'name': 'insert' },
+    ],
+};

src/test/rustdoc-js/path-ordering.js

@@ -0,0 +1,14 @@
+// exact-check
+
+const QUERY = 'b::ccccccc';
+
+const EXPECTED = {
+    'others': [
+        // `ccccccc` is an exact match for all three of these.
+        // However `b` is a closer match for `bb` than for any
+        // of the others, so it ought to go first.
+        { 'path': 'path_ordering::bb', 'name': 'Ccccccc' },
+        { 'path': 'path_ordering::aa', 'name': 'Ccccccc' },
+        { 'path': 'path_ordering::dd', 'name': 'Ccccccc' },
+    ],
+};

src/test/rustdoc-js/path-ordering.rs

@@ -0,0 +1,9 @@
+pub mod dd {
+    pub struct Ccccccc;
+}
+pub mod aa {
+    pub struct Ccccccc;
+}
+pub mod bb {
+    pub struct Ccccccc;
+}