Trying some alternative fixes for the popup shadow issue on Windows.

src/SocialWidget.cpp

@@ -41,9 +41,9 @@ SocialWidget::SocialWidget( QWidget* parent )
 {
     ui->setupUi( this );
 #ifndef Q_OS_WIN
-    setWindowFlags( Qt::FramelessWindowHint );
-    setWindowFlags( Qt::Popup );
+    setWindowFlags( Qt::FramelessWindowHint ); //this causes ugly black shadows on Windows
 #endif
+    setWindowFlags( Qt::Popup );
     setAttribute( Qt::WA_TranslucentBackground, true );
 
     TomahawkUtils::unmarginLayout( layout() );

src/libtomahawk/widgets/SourceTreePopupDialog.cpp

@@ -112,6 +112,9 @@ SourceTreePopupDialog::SourceTreePopupDialog()
                             background-color: #D35052; \
                             border-style: flat; \
                         }" );*/
+#ifdef Q_OS_WIN
+    setMask( geometry() );
+#endif
 }
 
 void