[5.4] Fix TinyMCE default folder for uploads

plugins/editors/tinymce/src/PluginTraits/DisplayTrait.php

@@ -10,11 +10,13 @@
 
 namespace Joomla\Plugin\Editors\TinyMCE\PluginTraits;
 
+use Joomla\CMS\Component\ComponentHelper;
 use Joomla\CMS\Filter\InputFilter;
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\Layout\LayoutHelper;
 use Joomla\CMS\Session\Session;
 use Joomla\CMS\Uri\Uri;
+use Joomla\Component\Media\Administrator\Exception\ProviderAccountNotFoundException;
 use Joomla\Component\Media\Administrator\Provider\ProviderManagerHelperTrait;
 use Joomla\Registry\Registry;
 
@@ -327,14 +329,29 @@ public function display(string $name, string $content = '', array $attributes =
             $wa->useScript('plg_editors_tinymce.jdragndrop');
             $plugins[]  = 'jdragndrop';
             $uploadUrl  = Uri::base(true) . '/index.php?option=com_media&format=json&url=1&task=api.files';
-            $uploadPath = $levelParams->get('path', '');
+            $uploadPath = $levelParams->get('path', ComponentHelper::getParams('com_media')->get('image_path', 'images'));
 
             // Make sure the path is full, and contain the media adapter in it.
             $mediaHelper = new class () {
                 use ProviderManagerHelperTrait;
 
                 public function prepareTinyMCEUploadPath(string $path): string
                 {
+                    // Check for the path includes the adapter
+                    if (!str_contains($path, ':')) {
+                        try {
+                            /*
+                             * We got old folder name without adapter eg "images".
+                             * Look whether the adapter exists for this folder, otherwise everything will fallback to default.
+                             */
+                            $this->getAdapter('local-' . $path);
+                            // Adapter exists, update the path
+                            $path = 'local-' . $path . ':/';
+                        } catch (ProviderAccountNotFoundException) {
+                            // Nothing found
+                        }
+                    }
+
                     $result = $this->resolveAdapterAndPath($path);
 
                     return implode(':', $result);