Method modifyText

src/utils/Cursor.ts:820–834

(end: Cursor, insertString: string = '')

  }

  modifyText(end: Cursor, insertString: string = ''): Cursor {
    const startOffset = this.offset
    const endOffset = end.offset

    const newText =
      this.text.slice(0, startOffset) +
      insertString +
      this.text.slice(endOffset)

    return Cursor.fromText(
      newText,
      this.columns,
      startOffset + insertString.normalize('NFC').length,
    )
  }

  insert(insertString: string): Cursor {
    const newCursor = this.modifyText(this, insertString)