Sync with upstream rust-lang#126176

Author: Folyd

Diff for: src/librustdoc/html/static/js/search-core.js

@@ -3134,15 +3134,19 @@ class DocSearch {
              * @param {boolean} isAssocType
              */
             const convertNameToId = (elem, isAssocType) => {
-                if (this.typeNameIdMap.has(elem.normalizedPathLast) &&
-                    (isAssocType || !this.typeNameIdMap.get(elem.normalizedPathLast).assocOnly)) {
-                    elem.id = this.typeNameIdMap.get(elem.normalizedPathLast).id;
+                const loweredName = elem.pathLast.toLowerCase();
+                if (typeNameIdMap.has(loweredName) &&
+                    (isAssocType || !typeNameIdMap.get(loweredName).assocOnly)) {
+                    elem.id = typeNameIdMap.get(loweredName).id;
                 } else if (!parsedQuery.literalSearch) {
                     let match = null;
                     let matchDist = maxEditDistance + 1;
                     let matchName = "";
                     for (const [name, { id, assocOnly }] of this.typeNameIdMap) {
-                        const dist = editDistance(name, elem.normalizedPathLast, maxEditDistance);
+                        const dist = Math.min(
+                            editDistance(name, loweredName, maxEditDistance),
+                            editDistance(name, elem.normalizedPathLast, maxEditDistance),
+                        );
                         if (dist <= matchDist && dist <= maxEditDistance &&
                             (isAssocType || !assocOnly)) {
                             if (dist === matchDist && matchName > name) {