Summary of Changes

After #45352 is merged, more issues with the menu can be fixed. This PR now fixes two issues:

• When there are more than two levels of menu items in the backend, the deeper levels has no correct padding
• When one of the sub-levels are opened there is a JS error and after refreshing the page the menu does not stay open

Testing Instructions

This is a bit tricky, as we have to kind of fake a deep hierarchy in the backend. So either create your own custom backend menu or we use a little trick to inject a deeper hierachy:

• Open administrator/modules/mod_menu/src/Menu/CssMenu.php
• Add the following code after line 423:

elseif ($item->element === 'com_contact' && isset($query['view']) && $query['view'] === 'contacts') {
    MenusHelper::loadPreset('content', false, $item);
}

This will load the content menu below the com_contact menu.

Actual result BEFORE applying this Pull Request

• When opening the deep hierarchy, a JS error is thrown:

Expected result AFTER applying this Pull Request

• No JS error
• Active menu item is visible
• Styling is correct

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed