Rollup merge of rust-lang#79796 - GuillaumeGomez:hide-associated-const-when-collapsing, r=jyn514

Hide associated constants too when collapsing implementation

Fixes rust-lang#71849.

r? `@jyn514`

Author: GuillaumeGomez

src/librustdoc/html/static/main.js

@@ -2274,9 +2274,12 @@ function defocusSearchBar() {
 
         function implHider(addOrRemove, fullHide) {
             return function(n) {
-                var is_method = hasClass(n, "method") || fullHide;
-                if (is_method || hasClass(n, "type")) {
-                    if (is_method === true) {
+                var shouldHide =
+                    fullHide === true ||
+                    hasClass(n, "method") === true ||
+                    hasClass(n, "associatedconstant") === true;
+                if (shouldHide === true || hasClass(n, "type") === true) {
+                    if (shouldHide === true) {
                         if (addOrRemove) {
                             addClass(n, "hidden-by-impl-hider");
                         } else {