Prevent clicking on a link or on a button to toggle the code example buttons visibility

Author: GuillaumeGomez

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

@@ -1832,10 +1832,14 @@ href="https://doc.rust-lang.org/${channel}/rustdoc/read-documentation/search.htm
     function getExampleWrap(event) {
         let elem = event.target;
         while (!hasClass(elem, "example-wrap")) {
-            elem = elem.parentElement;
-            if (elem.tagName === "body" || hasClass(elem, "docblock")) {
+            if (elem.tagName === "BODY" ||
+                elem.tagName === "A" ||
+                elem.tagName === "BUTTON" ||
+                hasClass(elem, "docblock"))
+            {
                 return null;
             }
+            elem = elem.parentElement;
         }
         return elem;
     }

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

@@ -21,6 +21,12 @@ move-cursor-to: ".search-input"
 assert-count: (".example-wrap:not(:hover) .button-holder.keep-visible", 0)
 assert-css: (".example-wrap .copy-button", { "visibility": "hidden" })
 
+// Clicking on the "copy code" button shouldn't make the buttons stick.
+click: ".example-wrap .copy-button"
+move-cursor-to: ".search-input"
+assert-count: (".example-wrap:not(:hover) .button-holder.keep-visible", 0)
+assert-css: (".example-wrap .copy-button", { "visibility": "hidden" })
+
 define-function: (
     "check-buttons",
     [theme, background, filter, filter_hover],