// Set link
  QTextCharFormat charFormat;
  charFormat.setAnchorHref(refereceUrl);

  // If link not empty
  if(refereceUrl.length()>0)
  {
    charFormat.setAnchor(true);
    textArea->textCursor().mergeCharFormat(charFormat);
  }
  else
  {
    // Else link is empty, and we do remove anchor
    charFormat.setAnchor(false);
    textArea->textCursor().setCharFormat(charFormat);
  }

The anchor for selected text is setted, but text dont underline and blue. Text visible as normal text.

In HTML source i see:

Before set anchor:

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">This any text.</p>

After set anchor to word "any":

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">This <a href="https://link.com">any</a> text.</p>

... and word "any" view as normal word without underline and blue color.

But! If get all HTML code from textArea.html, and set it again by textArea.setHtml(), then whord "any" view as underline and blue color. The HTML-code Qt automatic set to:

<p style=" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;">This <a href="https://link.ru"><span style=" text-decoration: underline; color:#0000ff;">any</span></a> text.</p>

I have this problem now (Qt 5.4.2), and find this problem in Russian forum at 2010 year:

http://www.forum.crossplatform.ru/index.php?showtopic=4670&mode=linearplus

Q: This is bug? If this is not bug, please write, how to set anchor in QTextEdit as underline and blue color.