rustdoc-search: fix where clause highlight with dup generics

Essentially, the unifier only adds generics to a parameter when
a part of its where clause is highlighted. To make that work,
the formatter can ignore the empties.

Author: notriddle

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

@@ -1572,7 +1572,9 @@ function initSearch(rawSearchIndex) {
                     for (const nested of fnType.generics) {
                         writeFn(nested, where);
                     }
-                    whereClause.set(fnParamNames[-1 - fnType.id], where);
+                    if (where.length > 0) {
+                        whereClause.set(fnParamNames[-1 - fnType.id], where);
+                    }
                 } else {
                     if (fnType.ty === TY_PRIMITIVE) {
                         if (fnType.id === typeNameIdOfArray || fnType.id === typeNameIdOfSlice ||
@@ -2913,7 +2915,7 @@ function initSearch(rawSearchIndex) {
             sorted_returned,
             sorted_others,
             parsedQuery);
-        await handleAliases(ret, parsedQuery.original.replace(/"/g, ""),
+        await handleAliases(ret, parsedQuery.userQuery.replace(/"/g, ""),
             filterCrates, currentCrate);
         await Promise.all([ret.others, ret.returned, ret.in_args].map(async list => {
             const descs = await Promise.all(list.map(result => {

tests/rustdoc-js-std/parser-errors.js

@@ -195,7 +195,6 @@ const PARSED = [
         query: "a:b",
         elems: [],
         foundElems: 0,
-        original: "a:b",
         returned: [],
         userQuery: "a:b",
         error: "Unknown type filter `a`",

tests/rustdoc-js-std/vec-type-signatures.js

@@ -19,4 +19,16 @@ const EXPECTED = [
             { 'path': 'std::vec::IntoIter', 'name': 'next_chunk' },
         ],
     },
+    {
+        'query': 'vec<Allocator> -> Box<[T]>',
+        'others': [
+            {
+                'path': 'std::boxed::Box',
+                'name': 'from',
+                'displayType': '`Vec`<T, `A`> -> `Box`<`[T]`, A>',
+                'displayMappedNames': `T = T`,
+                'displayWhereClause': 'A: `Allocator`',
+            },
+        ],
+    },
 ];

tests/rustdoc-js/non-english-identifier.js

@@ -11,7 +11,6 @@ const PARSED = [
         }],
         returned: [],
         foundElems: 1,
-        original: "中文",
         userQuery: "中文",
         error: null,
     },
@@ -26,7 +25,6 @@ const PARSED = [
             typeFilter: -1,
         }],
         foundElems: 1,
-        original: "_0Mixed中英文",
         returned: [],
         userQuery: "_0mixed中英文",
         error: null,
@@ -42,7 +40,6 @@ const PARSED = [
             typeFilter: -1,
         }],
         foundElems: 1,
-        original: "my_crate::中文API",
         returned: [],
         userQuery: "my_crate::中文api",
         error: null,
@@ -71,7 +68,6 @@ const PARSED = [
         foundElems: 3,
         totalElems: 5,
         literalSearch: true,
-        original: "类型A,类型B<约束C>->返回类型<关联类型=路径::约束D>",
         returned: [{
             name: "返回类型",
             fullPath: ["返回类型"],
@@ -93,7 +89,6 @@ const PARSED = [
             typeFilter: 16,
         }],
         foundElems: 1,
-        original: "my_crate 中文宏!",
         returned: [],
         userQuery: "my_crate 中文宏!",
         error: null,
@@ -102,7 +97,6 @@ const PARSED = [
         query: '非法符号——',
         elems: [],
         foundElems: 0,
-        original: "非法符号——",
         returned: [],
         userQuery: "非法符号——",
         error: "Unexpected `—` after `号` (not a valid identifier)",