[rustdoc] Make the buttons remain when code example is clicked

src/librustdoc/html/static/css/rustdoc.css

@@ -1474,7 +1474,20 @@ a.test-arrow:hover {
 .example-wrap:hover > .test-arrow {
 	padding: 2px 7px;
 }
-.example-wrap:hover > .test-arrow, .example-wrap:hover > .button-holder {
+/*
+On iPad, the ":hover" state sticks around, making things work not greatly. Do work around
+it, we move it into this media query. More information can be found at:
+https://css-tricks.com/solving-sticky-hover-states-with-media-hover-hover/
+
+However, using `@media (hover: hover)` makes this rule never to be applied in GUI tests, so
+instead, we check that it's not a "finger" cursor.
+*/
+@media not (pointer: coarse) {
+	.example-wrap:hover > .test-arrow, .example-wrap:hover > .button-holder {
+		visibility: visible;
+	}
+}
+.example-wrap .button-holder.keep-visible {
 	visibility: visible;
 }
 .example-wrap .button-holder .copy-button {

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

@@ -1829,14 +1829,22 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
         copyContentToClipboard(codeElem.textContent);
     }
 
-    function addCopyButton(event) {
+    function getExampleWrap(event) {
         let elem = event.target;
         while (!hasClass(elem, "example-wrap")) {
             elem = elem.parentElement;
             if (elem.tagName === "body" || hasClass(elem, "docblock")) {
-                return;
+                return null;
             }
         }
+        return elem;
+    }
+
+    function addCopyButton(event) {
+        const elem = getExampleWrap(event);
+        if (elem === null) {
+            return;
+        }
         // Since the button will be added, no need to keep this listener around.
         elem.removeEventListener("mouseover", addCopyButton);
 
@@ -1858,7 +1866,20 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
         parent.appendChild(copyButton);
     }
 
+    function showHideCodeExampleButtons(event) {
+        const elem = getExampleWrap(event);
+        if (elem === null) {
+            return;
+        }
+        const buttons = elem.querySelector(".button-holder");
+        if (buttons === null) {
+            return;
+        }
+        buttons.classList.toggle("keep-visible");
+    }
+
     onEachLazy(document.querySelectorAll(".docblock .example-wrap"), elem => {
         elem.addEventListener("mouseover", addCopyButton);
+        elem.addEventListener("click", showHideCodeExampleButtons);
     });
 }());

tests/rustdoc-gui/code-example-buttons.goml

@@ -0,0 +1,21 @@
+// This test ensures that code blocks buttons are displayed on hover and when you click on them.
+go-to: "file://" + |DOC_PATH| + "/test_docs/fn.foo.html"
+
+// First we check we "hover".
+move-cursor-to: ".example-wrap"
+assert-css: (".example-wrap .copy-button", { "visibility": "visible" })
+move-cursor-to: ".search-input"
+assert-css: (".example-wrap .copy-button", { "visibility": "hidden" })
+
+// Now we check the click.
+assert-count: (".example-wrap:not(:hover) .button-holder.keep-visible", 0)
+click: ".example-wrap"
+move-cursor-to: ".search-input"
+// It should have a new class and be visible.
+wait-for-count: (".example-wrap:not(:hover) .button-holder.keep-visible", 1)
+wait-for-css: (".example-wrap:not(:hover) .button-holder.keep-visible", { "visibility": "visible" })
+// Clicking again will remove the class.
+click: ".example-wrap"
+move-cursor-to: ".search-input"
+assert-count: (".example-wrap:not(:hover) .button-holder.keep-visible", 0)
+assert-css: (".example-wrap .copy-button", { "visibility": "hidden" })