Rollup merge of rust-lang#140868 - SpecificProtagonist:rustdoc-trait-impl-code-link, r=notriddle

rustdoc: Fix links with inline code in trait impl docs

Fixes rust-lang#140857

Author: matthiaskrgr

src/librustdoc/html/static/js/main.js

@@ -1179,8 +1179,10 @@ function preLoadCss(cssUrl) {
 
     onEachLazy(document.querySelectorAll(".toggle > summary:not(.hideme)"), el => {
         // @ts-expect-error
+        // Clicking on the summary's contents should not collapse it,
+        // but links within should still fire.
         el.addEventListener("click", e => {
-            if (e.target.tagName !== "SUMMARY" && e.target.tagName !== "A") {
+            if (!e.target.matches("summary, a, a *")) {
                 e.preventDefault();
             }
         });

tests/rustdoc-gui/collapse-trait-impl.goml

@@ -0,0 +1,26 @@
+// Checks that individual trait impls can only be collapsed via clicking directly on the summary element
+
+go-to: "file://" + |DOC_PATH| + "/test_docs/struct.Foo.html"
+assert-attribute: ("details:has(#trait-impl-link-in-summary)", {"open": ""})
+
+// Collapse the trait impl doc. The actual clickable area is outside the element, hence offset.
+click-with-offset: ("summary:has(#trait-impl-link-in-summary)", {"x": -15, "y": 5})
+assert-attribute-false: ("details:has(#trait-impl-link-in-summary)", {"open": ""})
+click-with-offset: ("summary:has(#trait-impl-link-in-summary)", {"x": -15, "y": 5})
+assert-attribute: ("details:has(#trait-impl-link-in-summary)", {"open": ""})
+
+// Clicks on the text should be ignored
+click: "summary:has(#trait-impl-link-in-summary) > .impl"
+assert-attribute: ("details:has(#trait-impl-link-in-summary)", {"open": ""})
+
+// But links should still work
+click: "summary:has(#trait-impl-link-in-summary) a:has(#trait-impl-link-in-summary)"
+assert-window-property-false: ({"pageYOffset": "0"})
+assert-attribute: ("details:has(#trait-impl-link-in-summary)", {"open": ""})
+
+// As well as clicks on elements within links
+go-to: "file://" + |DOC_PATH| + "/test_docs/struct.Foo.html"
+assert-window-property: ({"pageYOffset": "0"})
+click: "#trait-impl-link-in-summary"
+assert-window-property-false: ({"pageYOffset": "0"})
+assert-attribute: ("details:has(#trait-impl-link-in-summary)", {"open": ""})

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

@@ -79,6 +79,7 @@ impl Foo {
     pub fn warning2() {}
 }
 
+/// <a href="#implementations"><code id="trait-impl-link-in-summary">A collapsible trait impl with a link</code></a>
 impl AsRef<str> for Foo {
     fn as_ref(&self) -> &str {
         "hello"