Clang: Fix displaying template parameters

...in the function call completion tooltip.

We did not escape the HTML.

Change-Id: I5c27e5c29c1b29117201e933ac172c98792cef2b
Task-number: QTCREATORBUG-15286
Reviewed-by: Marco Bubke <marco.bubke@theqtcompany.com>
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/texteditor/codeassist/functionhintproposalwidget.cpp

@@ -290,7 +290,7 @@ bool FunctionHintProposalWidget::updateAndCheck(const QString &prefix)
 
 void FunctionHintProposalWidget::updateContent()
 {
-    d->m_hintLabel->setText(d->m_model->text(d->m_currentHint));
+    d->m_hintLabel->setText(d->m_model->text(d->m_currentHint).toHtmlEscaped());
     d->m_numberLabel->setText(tr("%1 of %2").arg(d->m_currentHint + 1).arg(d->m_totalHints));
     updatePosition();
 }