fix: crash in toggleViewsHints - debugDiv.appendChild (toolbar.js) (#9735)

* fix: prevent variable leaking in loop (#9727)

* docs: updated changelog

Author: mjomble

system/Debug/Toolbar/Views/toolbar.js

@@ -440,7 +440,7 @@ var ciDebugBar = {
                 var debugPath = document.createElement("div"); // path
                 var childArray = startElement[0].parentNode.childNodes; // target child array
                 var parent = startElement[0].parentNode;
-                var start, end;
+                let start, end;
 
                 // setup container
                 debugDiv.classList.add("debug-view");

user_guide_src/source/changelogs/v4.6.4.rst

@@ -45,6 +45,7 @@ Bugs Fixed
 - **Model:** Fixed a bug in ``Model::replace()`` where ``created_at`` field (when available) wasn't set correctly.
 - **Model:** Fixed a bug in ``Model::insertBatch()`` and ``Model::updateBatch()`` where casts were not applied to inserted or updated values.
 - **Toolbar:** Fixed bugs in ``Collectors\Logs`` that were preventing the "Logs" tab from appearing on the Debug Toolbar.
+- **Toolbar:** Fixed bugs in ``toolbar.js`` which caused "Uncaught TypeError" in some scenarios.
 - **Validation:** Fixed a bug in the ``FormatRules::valid_base64()`` validation rule that caused a TypeError when checking invalid base64 strings.
 
 See the repo's