ENH: Improve ctkFittedTextBrowser collapsed text formatting

Show ellipsis (...) where the collapsed text is cut.

Remove teaser separator(line break) character instead of replacing with space. This allows better control of what is displayed.
For example: "Some teaser<br>. This is more info." text expanded version was displayed as "Some teaser . This is more info.", but
now it is shown as "Some teaser. This is more info."

Libs/Widgets/ctkFittedTextBrowser.cpp

@@ -77,7 +77,7 @@ QString ctkFittedTextBrowserPrivate::collapsedTextFromPlainText() const
   finalText.append(this->collapseLinkText());
   finalText.append("</html>");
   // Remove line break to allow continuation of line.
-  finalText.replace(finalText.indexOf('\n'), 1, ' ');
+  finalText.replace(finalText.indexOf('\n'), 1, "");
   // In plain text line breaks were indicated by newline, but we now use html,
   // so line breaks must use <br>
   finalText.replace("\n", "<br>");
@@ -110,7 +110,7 @@ QString ctkFittedTextBrowserPrivate::collapsedTextFromHtml() const
   {
     // Remove <br> to allow continuation of line and avoid extra space
     // when <p> element is used as well.
-    finalText.replace(finalText.indexOf(lineBreak), lineBreak.size(), " ");
+    finalText.replace(finalText.indexOf(lineBreak), lineBreak.size(), "");
     // Add link text before closing </body> or </html> tag
     if (finalText.contains("</body>"))
     {
@@ -134,7 +134,7 @@ QString ctkFittedTextBrowserPrivate::collapseLinkText() const
   Q_Q(const ctkFittedTextBrowser);
   if (this->Collapsed)
   {
-    return QString(" <a href=\"#") + moreAnchor + "\">" + this->ShowDetailsText + "</a>";
+    return QString("&hellip; <a href=\"#") + moreAnchor + "\">" + this->ShowDetailsText + "</a>";
   }
   else
   {