Fix no results when searching for == in doc

Author: chenyukang

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

@@ -1556,9 +1556,10 @@ class DocSearch {
             return query;
         }
         if (!query.literalSearch) {
-            // If there is more than one element in the query, we switch to literalSearch in any
-            // case.
-            query.literalSearch = parserState.totalElems > 1;
+            // If there is more than one element or only separators in the query,
+            // we switch to literalSearch in any case.
+            query.literalSearch = parserState.totalElems > 1 ||
+                userQuery.replace(/[=, ]/g, "") === "";
         }
         query.foundElems = query.elems.length + query.returned.length;
         query.totalElems = parserState.totalElems;

tests/rustdoc-gui/search-query-equals-eqeq.goml

@@ -0,0 +1,17 @@
+// Regression test for https://github.com/rust-lang/rust/issues/150921
+//
+// Ensure `?search===` (unencoded value `==`) round-trips through query-string parsing so
+// `==` searches work.
+include: "utils.goml"
+
+// NOTE: This intentionally uses an *unencoded* value of `==`.
+// In a query string, that means `?search===` (one '=' for the delimiter, two for the value).
+go-to: "file://" + |DOC_PATH| + "/lib2/index.html?search==="
+
+// Wait for search results to be available.
+wait-for: "#crate-search"
+wait-for-false: "#search-tabs .count.loading"
+
+// `OperatorEqEqAlias` has `#[doc(alias = "==")]`.
+wait-for: "//a[contains(@href,'struct.OperatorEqEqAlias.html')]"
+assert: "//a[contains(@href,'struct.OperatorEqEqAlias.html')]"

tests/rustdoc-gui/search-query-equals-noteq.goml

@@ -0,0 +1,17 @@
+// Regression test for https://github.com/rust-lang/rust/issues/150921
+//
+// Ensure `?search=!=` (unencoded value `!=`) round-trips through query-string parsing so
+// `!=` searches work.
+include: "utils.goml"
+
+// NOTE: This intentionally uses an *unencoded* value of `!=`.
+// In a query string, that means `?search=!=` (one '=' for the delimiter, one for the value).
+go-to: "file://" + |DOC_PATH| + "/lib2/index.html?search=!="
+
+// Wait for search results to be available.
+wait-for: "#crate-search"
+wait-for-false: "#search-tabs .count.loading"
+
+// `OperatorNotEqAlias` has `#[doc(alias = "!=")]`.
+wait-for: "//a[contains(@href,'struct.OperatorNotEqAlias.html')]"
+assert: "//a[contains(@href,'struct.OperatorNotEqAlias.html')]"

tests/rustdoc-gui/src/lib2/lib.rs

@@ -16,6 +16,12 @@ pub mod module {
     pub fn whatever() {}
 }
 
+#[doc(alias = "==")]
+pub struct OperatorEqEqAlias;
+
+#[doc(alias = "!=")]
+pub struct OperatorNotEqAlias;
+
 pub fn foobar() {}
 
 pub type Alias = u32;
@@ -149,14 +155,30 @@ pub trait LongTraitWithParamsBananaBananaBanana<T> {}
 
 impl LongTraitWithParamsBananaBananaBanana<usize> for HasALongTraitWithParams {}
 
-#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "emscripten", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd")))]
+#[doc(cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "emscripten",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "netbsd",
+    target_os = "openbsd"
+)))]
 pub struct LongItemInfo;
 
 pub trait SimpleTrait {}
 pub struct LongItemInfo2;
 
 /// Some docs.
-#[doc(cfg(any(target_os = "android", target_os = "linux", target_os = "emscripten", target_os = "dragonfly", target_os = "freebsd", target_os = "netbsd", target_os = "openbsd")))]
+#[doc(cfg(any(
+    target_os = "android",
+    target_os = "linux",
+    target_os = "emscripten",
+    target_os = "dragonfly",
+    target_os = "freebsd",
+    target_os = "netbsd",
+    target_os = "openbsd"
+)))]
 impl SimpleTrait for LongItemInfo2 {}
 
 pub struct WhereWhitespace<T>(T);
@@ -165,7 +187,9 @@ impl<T> WhereWhitespace<T> {
     pub fn new<F>(f: F) -> Self
     where
         F: FnMut() -> i32,
-    {todo!()}
+    {
+        todo!()
+    }
 }
 
 impl<K, T> Whitespace<&K> for WhereWhitespace<T>