[BUGFIX] Merge code editor settings properly

The settings for the `typo3-t3editor-codemirror` element were passed in
an `options` attribute, which is unknown. This leads to the issue that
e.g. the `readOnly` flag set in TCA is ignored.

The composed settings are now properly merged.

Resolves: #104084
Releases: main, 12.4
Change-Id: I7e34a8230764c33b7924128176088ab32cb35a58
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84699


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>

typo3/sysext/t3editor/Classes/Form/Element/T3editorElement.php

@@ -115,7 +115,7 @@ class T3editorElement extends AbstractFormElement
 
         $settings = [];
         if ($parameterArray['fieldConf']['config']['readOnly'] ?? false) {
-            $settings['readOnly'] = true;
+            $settings['readonly'] = true;
         }
 
         $editorHtml = $this->getHTMLCodeForEditor(
@@ -213,13 +213,12 @@ class T3editorElement extends AbstractFormElement
                 $keymaps[] = $keymap;
             }
         }
-        $codeMirrorConfig = [
+        $codeMirrorConfig = array_merge($settings, [
             'name' => $name,
             'mode' => GeneralUtility::jsonEncodeForHtmlAttribute($mode->getModule(), false),
             'addons' => GeneralUtility::jsonEncodeForHtmlAttribute($addons, false),
             'keymaps' => GeneralUtility::jsonEncodeForHtmlAttribute($keymaps, false),
-            'options' => GeneralUtility::jsonEncodeForHtmlAttribute($settings, false),
-        ];
+        ]);
 
         $code[] = '<typo3-t3editor-codemirror ' . GeneralUtility::implodeAttributes($codeMirrorConfig, true) . '>';
         $code[] = '<textarea ' . GeneralUtility::implodeAttributes($attributes, true) . '>' . htmlspecialchars($content) . '</textarea>';