Try a different QtCurve hack that intercepts QProxyStyle::polish to

avoid infinite loop.

src/TomahawkWindow.cpp

@@ -213,7 +213,19 @@ TomahawkWindow::saveSettings()
 void
 TomahawkWindow::applyPlatformTweaks()
 {
-    qApp->setStyle( new ProxyStyle() );
+    // HACK: QtCurve causes an infinite loop on startup. This is because
+    //       setStyle calls setPalette, which calls ensureBaseStyle, which loads
+    //       QtCurve. QtCurve calls setPalette, which creates an infinite loop.
+    //       We could simply not use ProxyStyle under QtCurve, but that would
+    //       make the whole UI look like crap.
+    //       Instead, we tell ProxyStyle that it's running under QtCurve, so it
+    //       can intercept QStyle::polish (which in the base implementation does
+    //       nothing and in QtCurve does evil things), and avoid forwarding it
+    //       to QtCurve.
+    bool isQtCurve = false;
+    if( QString( qApp->style()->metaObject()->className() ).toLower().contains( "qtcurve" ) )
+        isQtCurve = true;
+    qApp->setStyle( new ProxyStyle( isQtCurve ) );
 
 #ifdef Q_OS_MAC
     setUnifiedTitleAndToolBarOnMac( true );

src/libtomahawk/utils/ProxyStyle.cpp

@@ -30,6 +30,18 @@
 #define ARROW_HEIGHT 7
 
 
+ProxyStyle::ProxyStyle( bool isQtCurve )
+    : m_isQtCurve( isQtCurve )
+{
+}
+
+void
+ProxyStyle::polish( QPalette& pal )
+{
+    if( !m_isQtCurve )
+        QProxyStyle::polish( pal );
+}
+
 void
 ProxyStyle::drawPrimitive( PrimitiveElement pe, const QStyleOption* opt, QPainter* p, const QWidget* w ) const
 {

src/libtomahawk/utils/ProxyStyle.h

@@ -27,11 +27,18 @@
 class DLLEXPORT ProxyStyle : public QProxyStyle
 {
 public:
-    ProxyStyle() {}
+    ProxyStyle( bool isQtCurve = false );
+
+    virtual void polish( QApplication *a ) { QProxyStyle::polish( a ); }
+    virtual void polish( QPalette& pal );
+    virtual void polish( QWidget *w ) { QProxyStyle::polish( w ); }
 
     virtual void drawPrimitive( PrimitiveElement pe, const QStyleOption *opt, QPainter *p, const QWidget *w = 0 ) const;
     virtual void drawControl( ControlElement ce, const QStyleOption *opt, QPainter *p, const QWidget *w = 0 ) const;
     virtual QSize sizeFromContents( ContentsType type, const QStyleOption *option, const QSize &size, const QWidget *widget ) const;
+
+private:
+    bool m_isQtCurve;
 };
 
 #endif // PROXYSTYLE_H