Copy / paste mathtype formul on ckeditor

## Description When you copy/paste a mathtype formula into ckeditor (without opening the mathtype editor), you end up with two elements in ckeditor: the image of the formula and the formula; Reproductible on https://ckeditor.com/mathtype/ ## Environment - ckdeditor : 45.1.0 - mathtype-ckeditor5 : ^8.13.1 _What is the relevant software and their versions?_ - _Editor : CKEditor - _Browser : Chrome - _Operating System : Windows ## Steps to reproduce 1. copy a mathtype formula in ckeditor 2. past the mathtype formula in ckeditor ## Expected result only mathtype formula should be display ## Actual result two mathtype formula is display : An image and a formula ## Other details my working patch 👍 ````javascript function normalizeSpecialCharacters(inputText) { if (typeof inputText !== 'string') { // If the input is not a string (e.g., null, undefined, number), // return it as is or an empty string, depending on desired behavior. // Here, returning it as is or an empty string if null/undefined. return inputText === null || inputText === undefined ? '' : String(inputText); } let result = inputText; result = result.replace(/«/g, '<'); // Replace « (U+00AB) with < (U+003C) result = result.replace(/»/g, '>'); // Replace » (U+00BB) with > (U+003E) result = result.replace(/§/g, '&'); // Replace § (U+00A7) with & (U+0026) result = result.replace(/¨/g, '"'); // Replace ¨ (U+00A8) with " (U+0022) result = result.replace(/`/g, "'"); // Replace ` (U+0060) with ' (U+0027) return result; } editor.plugins.get( 'ClipboardPipeline' ).on( 'inputTransformation', ( evt, data ) => { const htmlContent = data.dataTransfer.getData( 'text/html' ); if ( !htmlContent ) { return; // No HTML content to process } let mathml = null; let isMathTypeContent = false; // 1. Try to detect an image with the data-mathml attribute const tempDiv = document.createElement('div'); tempDiv.innerHTML = htmlContent; const mathTypeImage = tempDiv.querySelector('img[data-mathml]'); if ( mathTypeImage ) { const rawMathml = mathTypeImage.getAttribute('data-mathml'); if (rawMathml) { const textPara = document.createElement('p'); textPara.innerHTML = rawMathml; // The browser decodes HTML entities here mathml = textPara.textContent || textPara.innerText || ""; isMathTypeContent = true; console.log('MathType Image with data-mathml detected. Extracted MathML:', mathml); } } // 2. If no image, look for raw MathML (math tag) if ( !isMathTypeContent ) { // Basic regex to find the first <math>...</math> tag const mathmlRegex = /(<math[\s\S]*?<\/math>)/i; const match = htmlContent.match(mathmlRegex); if (match && match[1]) { mathml = match[1]; isMathTypeContent = true; console.log('Raw MathML detected:', mathml); } } // 3. If MathType content was found, transform data.content if ( isMathTypeContent && mathml ) { try { // Use editor.data.processor.toView() to convert the MathML string // into a ViewDocumentFragment. This is the idiomatic and correct way. const mathmlViewFragment = editor.data.processor.toView(normalizeSpecialCharacters(mathml)); // Replace the existing content of data.content with the new fragment. // data.content is a ViewDocumentFragment. data.content = mathmlViewFragment; console.log('Replaced data.content with MathML ViewDocumentFragment for MathType plugin to process.'); // evt.stop(); // Uncomment if you want to explicitly stop further processing of this data. } catch (e) { console.error("Error parsing MathML with editor.data.processor.toView:", e); // In case of an error (e.g., malformed MathML), do not modify data.content // to let CKEditor handle the original content (which will likely be the image). } } }); ```` _Is there anything else to consider?_