Drop Qt 4 support

src/gui/properties/proplistdelegate.cpp

@@ -36,12 +36,8 @@
 #include <QStyleOptionProgressBar>
 
 #ifdef Q_OS_WIN
-#ifndef QBT_USES_QT5
-#include <QPlastiqueStyle>
-#else
 #include <QProxyStyle>
 #endif
-#endif
 
 #include "base/utils/misc.h"
 #include "base/utils/string.h"
@@ -106,11 +102,7 @@ void PropListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &opti
             QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
 #else
             // XXX: To avoid having the progress text on the right of the bar
-#ifndef QBT_USES_QT5
-            QPlastiqueStyle st;
-#else
             QProxyStyle st("fusion");
-#endif
             st.drawControl(QStyle::CE_ProgressBar, &newopt, painter, 0);
 #endif
         }