public TempTextLineCopyContext(TextLineBox textline, out Typography.Text.TextBufferSpan buffSpan)
{
_tempStBuilder = StringBuilderPool <StringBuilderPoolOwner> .GetFreeStringBuilder();
textline.CopyLineContent(_tempStBuilder);
int len = _tempStBuilder.Length;
char[] charBuffer = new char[len];
_tempStBuilder.CopyTo(0, charBuffer, 0, len);
buffSpan = new Typography.Text.TextBufferSpan(charBuffer);
}
// public void CopyLineContent(StringBuilder stBuilder) => _currentLine.CopyLineContent(stBuilder);