Fix: Preserve CKEditor5 instances in original blocks during copy operation

[Copilot]

When copying a block containing CKEditor5, the editor instance was removed from the original block due to jQuery's clone() copying the entire CKEditor5 UI structure (.ck-editor elements), which interfered with the active editor instance.

Changes

Core Fix (assets/mblock.js)

• Modified MBlockClipboard.copy() to temporarily detach CKE5 UI elements before cloning using jQuery's .detach()
• Reattach UI elements to original block after cloning completes
• Added validation to verify parent elements exist in DOM before reattachment
• Error handling with try-catch for graceful failure

Documentation

• Added inline documentation explaining the issue and solution approach
• Updated README to clarify CKEditor5 is supported (vs CKEditor4 which is not)

Technical Approach

// Before cloning: detach CKE5 UI elements
const cke5Editors = [];
item.find('.cke5-editor').each(function() {
    const $textarea = $(this);
    const $ckeUI = $textarea.next('.ck-editor');
    if ($ckeUI.length) {
        cke5Editors.push({ ckeUI: $ckeUI, parent: $ckeUI.parent(), nextSibling: $ckeUI.next() });
        $ckeUI.detach(); // Preserve events/data, just remove from DOM
    }
});

// Clone item (now only textareas, not CKE5 UI)
const clonedItem = item.clone(true, true);

// Restore CKE5 UI to original block
cke5Editors.forEach(editor => {
    if (editor.parent && document.contains(editor.parent[0])) {
        editor.ckeUI.insertBefore(editor.nextSibling) || editor.parent.append(editor.ckeUI);
    }
});

This ensures the original block's CKEditor5 instance remains intact while the cloned item contains only the textarea for proper reinitialization on paste.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>CKE5 Problem beim Kopieren</issue_title>
<issue_description>Wenn ein block mit CKE5 kopiert wird, wird cke5 im original entfernt aber nicht wiederhergestellt.
Alle anderen Blöcke bleiben davon unberührt das ist gut </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes CKE5 Problem beim Kopieren #217

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[skerbis]

du musst das build noch erstellen @copilot

[Copilot]

du musst das build noch erstellen @copilot

Der Build ist bereits erstellt und committed! Die Dateien assets/mblock.min.js und assets/mblock.min.js.map wurden in den Commits b369919, 34a723e und 518cd70 aktualisiert. Ich habe gerade nochmal gebaut um sicherzustellen - keine Änderungen nötig, alles ist aktuell. ✅