bug #15928 [2.8][WebProfilerBundle] Fix search button click listener (xelaris)

This PR was merged into the 2.8 branch.

Discussion
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[2.8][WebProfilerBundle] Fix search button click listener

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

This fixes an issue when clicking the sidebar "Search" button **text** instead of the **button**. Then the click event target/srcElement is the *span* child-element, instead of the listening *a* element, which causes errors in the listener, since it expects the listening element. In consequence of that the search form isn't shown.

To fix this, the same technique is used, as for the navigation tabs. Traversing the DOM up to the expected *a* element.

Commits
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f9ddddb [WebProfilerBundle] Fix search button click listener

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig

@@ -390,6 +390,13 @@
                         e.preventDefault();
 
                         var toggle = e.target || e.srcElement;
+
+                        /* needed because when the toggle contains HTML contents, user can click */
+                        /* on any of those elements instead of their parent '.sf-toggle' element */
+                        while (!Sfjs.hasClass(toggle, 'sf-toggle')) {
+                            toggle = toggle.parentNode;
+                        }
+
                         var element = document.querySelector(toggle.getAttribute('data-toggle-selector'));
 
                         Sfjs.toggleClass(element, 'sf-toggle-hidden');