/**
   * Each text shape can contain multiple paragraphs, and each paragraph can have multiple text runs, each holding a
   * part of the complete text. When replacing all text using the setText method on XSLFTextShape, the formatting might
   * get lost. So instead, this function sets the text in the first text run of the first paragraph, while emptying all
   * other text runs in all other paragraphs.
   * @param textShape The shape that contains the text to be replaced.
   * @param newText The new text.
   */
  private def replaceMaintainingTextFormat(textShape: XSLFTextShape, newText: String) = {
    for {
      (paragraph, paragraphIndex) <- textShape.getTextParagraphs.zipWithIndex
      (run, runIndex) <- paragraph.getTextRuns.zipWithIndex
    } {
      if (paragraphIndex == 0 && runIndex == 0) {
        run.setText(newText)
      } else {
        run.setText("")
      }
    }
  }