QToolTip width calculation must account for <br> breaks in long lines.

Consider this code:

#include <QApplication>
#include <QLabel>
#include <QHBoxLayout>

int main(int argc, char **argv)
{
QApplication app(argc, argv);

QWidget top;

QHBoxLayout layout;

const QString s("<table>"
"<tr><td>Line 1</td></tr>"
"<tr><td>Line 2%1</td></tr>"
"<tr><td>Line 3</td></tr>"
"</table>");
const QString line2b("Line 2b");

{ QLabel *const lbl = new QLabel(&top); lbl->setText("First Label"); lbl->setToolTip(s.arg(" " + line2b)); layout.addWidget(lbl); } { QLabel *const lbl = new QLabel(&top); lbl->setText("Second Label"); lbl->setToolTip(s.arg("<br>" + line2b)); layout.addWidget(lbl); } { QLabel *const lbl = new QLabel(&top); lbl->setText("Third Label"); lbl->setToolTip(s.arg("<table><tr><td>" + line2b + "</td></tr></table>")); layout.addWidget(lbl); }

top.setLayout(&layout);

top.show();
return app.exec();
}

This is not about text wrapping/layoutting, but the yellow background rectangle, which in the case of Second Label has an incorrectly computed width.