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-rw-r--r--src/gui/styles/qwindowsvistastyle.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/gui/styles/qwindowsvistastyle.cpp b/src/gui/styles/qwindowsvistastyle.cpp
index 298207d..6f3017a 100644
--- a/src/gui/styles/qwindowsvistastyle.cpp
+++ b/src/gui/styles/qwindowsvistastyle.cpp
@@ -364,7 +364,8 @@ void QWindowsVistaStyle::drawPrimitive(PrimitiveElement element, const QStyleOpt
w->setProperty("_q_stylestate", (int)option->state);
w->setProperty("_q_stylerect", w->rect());
- bool doTransition = ((state & State_Sunken) != (oldState & State_Sunken) ||
+ bool doTransition = oldState &&
+ ((state & State_Sunken) != (oldState & State_Sunken) ||
(state & State_On) != (oldState & State_On) ||
(state & State_MouseOver) != (oldState & State_MouseOver));