QTreeView: setting style sheet that specifies padding causes the corner widget to remain in view with only 1 scrollbar visible

To reproduce, set the following stylesheet on a QTreeView:-

#include <QtGui>

#include "treemodel.h"

int main(int argc, char *argv[])
{
Q_INIT_RESOURCE(simpletreemodel);

QApplication app(argc, argv);

QFile file(":/default.txt");
file.open(QIODevice::ReadOnly);
TreeModel model(file.readAll());
file.close();

QTreeView view;
QString ss =
" QTreeView

{ border: 0px; " " background-color: rgb(255, 255, 255); " " padding: 15px; " " border: 1px solid rgb(208, 208, 208); border-radius: 3px;}

"
" "
" QScrollBar

{ \ background: #f4f4f4; \ width: 16px; \ height: 16px; \ }

\
QScrollBar::add-page, QScrollBar::sub-page

{ \ background: transparent; \ }

\
QScrollBar::add-page:pressed, QScrollBar::sub-page:pressed

{ \ background: rgb(11,11,11); \ }

\
QScrollBar::add-line, QScrollBar::sub-line

{ \ border-style: none; \ height: 16px; \ width: 16px; \ subcontrol-origin: margin; \ }

\
QScrollBar:vertical

{\ margin: 16px 0 16px 0;\ }

\
\
QScrollBar::handle:vertical

{\ min-height: 15px;\ border-image: url(:/sksb/Resources/vertical_handle.png) 2;\ border: 2;\ }

\
QScrollBar::add-line:vertical

{ subcontrol-position: bottom; }

\
QScrollBar::sub-line:vertical

{ subcontrol-position: top; }

\
QScrollBar:horizontal

{ \ margin: 0 16px 0 16px; \ }

\
QScrollBar::handle:horizontal

{ \ min-width: 15px; \ border-image: url(:/sksb/Resources/horizontal-handle.png) 2; \ border: 2; \ }

\
QScrollBar::add-line:horizontal

{ subcontrol-position: right; }

\
QScrollBar::sub-line:horizontal

{ subcontrol-position: left; }

\
QScrollBar:up-arrow:vertical

{ image: url(:/sksb/Resources/up-arrow.png);}

\
QScrollBar:up-arrow:vertical:pressed

{ image: url(:/sksb/Resources/up-arrow-pressed.png);}

\
QScrollBar:down-arrow:vertical

{ image: url(:/sksb/Resources/down-arrow.png);}

\
QScrollBar:down-arrow:vertical:pressed

{ image: url(:/sksb/Resources/down-arrow-pressed.png);}

\
QScrollBar:left-arrow:horizontal

{ image: url(:/sksb/Resources/left-arrow.png);}

\
QScrollBar:left-arrow:horizontal:pressed

{ image: url(:/sksb/Resources/left-arrow-pressed.png); }

\
QScrollBar:right-arrow:horizontal

{ image: url(:/sksb/Resources/right-arrow.png); }

\
QScrollBar:right-arrow:horizontal:pressed

{ image: url(:/sksb/Resources/right-arrow-pressed.png); }

\
" ;

view.setStyleSheet(ss);
view.setModel(&model);
view.setWindowTitle(QObject::tr("Simple Tree Model"));
view.show();
return app.exec();
}

Now resize the widget so that one of the scrollbars is gone. The corner widget remains in view.