Rollup merge of rust-lang#65741 - GuillaumeGomez:help-popup, r=Dylan-DPC

Prevent help popup to disappear when clicking on it

Fixes rust-lang#65736.

r? @kinnison

Author: tmandry

src/librustdoc/html/static/main.js

@@ -379,9 +379,13 @@ function getSearchElement() {
 
                 set_fragment(cur_id);
             }
-        } else if (hasClass(document.getElementById("help"), "hidden") === false) {
-            addClass(document.getElementById("help"), "hidden");
-            removeClass(document.body, "blur");
+        } else if (hasClass(getHelpElement(), "hidden") === false) {
+            var help = getHelpElement();
+            var is_inside_help_popup = ev.target !== help && help.contains(ev.target);
+            if (is_inside_help_popup === false) {
+                addClass(help, "hidden");
+                removeClass(document.body, "blur");
+            }
         } else {
             // Making a collapsed element visible on onhashchange seems
             // too late