Enhance replaceText logic for CKEditor

online-editor.js

@@ -536,24 +536,36 @@ class BesEditor {
   // This function should be able to handle both cases or find a way that works for both.
   static replaceText(el, rect, match, replacement, editor) {
     // const tags = this.getTagsAndText(el)
+    if (!editor.CKEditorInstance) {
       const text = el.textContent
       const newText =
         text.substring(0, match.offset) +
         replacement +
         text.substring(match.offset + match.length)
       el.textContent = newText
-    if (editor.CKEditorInstance) {
+    } else {
       const { CKEditorInstance } = editor
       CKEditorInstance.model.change(writer => {
-        // Find the corresponding element in the model.
         const viewElement =
           CKEditorInstance.editing.view.domConverter.mapDomToView(el)
         const modelElement =
           CKEditorInstance.editing.mapper.toModelElement(viewElement)
-
         if (modelElement) {
-          writer.remove(writer.createRangeIn(modelElement))
+          const elementRange = writer.createRangeIn(modelElement)
-          writer.insertText(newText, modelElement, 'end')
+          // TODO: This logic should work once the HTML tags are removed from match.offset and match.length if is possible.
+          if (
+            elementRange.start.offset <= match.offset &&
+            elementRange.end.offset >= match.offset + match.length
+          ) {
+            const start = writer.createPositionAt(modelElement, match.offset)
+            const end = writer.createPositionAt(
+              modelElement,
+              match.offset + match.length
+            )
+            const range = writer.createRange(start, end)
+            writer.remove(range)
+            writer.insertText(replacement, start)
+          }
         }
       })
     }