internal PlaceholderTextRun(string text, PlaceholderTextRun textRun, SCRIPT_LOGATTR[] scriptLogAttr)
     : base(text, textRun, scriptLogAttr)
 {
     m_placeholderBorderColor = textRun.PlaceholderBorderColor;
 }
 internal PlaceholderTextRun(string text, PlaceholderTextRun textRun)
     : base(text, textRun)
 {
     m_placeholderBorderColor = textRun.PlaceholderBorderColor;
 }