Fix crash in indeterminate progressbars on windows

Note that this is a surgical fix for 4.7 only.
In 4.8 we will add these checks at the top
of the styling functions or in the widgets instead.

Task-number:QTBUG-15227
Reviewed-by:gabi

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/auto/qstyle/tst_qstyle.cpp b/tests/auto/qstyle/tst_qstyle.cpp
index ba24225..9c754d2 100644
--- a/tests/auto/qstyle/tst_qstyle.cpp
+++ b/tests/auto/qstyle/tst_qstyle.cpp
@@ -413,6 +413,13 @@ void tst_QStyle::testWindowsStyle()
     QWindowsStyle wstyle;
     testAllFunctions(&wstyle);
     lineUpLayoutTest(&wstyle);
+
+    // Tests drawing indeterminate progress with 0 size: QTBUG-15973
+    QStyleOptionProgressBar pb;
+    pb.rect = QRect(0,0,-9,0);
+    QPixmap surface(QSize(200, 200));
+    QPainter painter(&surface);
+    wstyle.drawControl(QStyle::CE_ProgressBar, &pb, &painter, 0);
 }
 
 void tst_QStyle::testWindowsXPStyle()