Enable to choose dark/light tray icons on all platforms.

src/gui/mainwindow.cpp

@@ -1588,6 +1588,10 @@ void MainWindow::checkForActiveTorrents()
 QIcon MainWindow::getSystrayIcon() const
 {
 #if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
+    if (Preferences::instance()->useSystemIconTheme())
+        return QIcon::fromTheme("qbittorrent");
+#endif
+
     TrayIcon::Style style = Preferences::instance()->trayIconStyle();
     switch(style) {
     case TrayIcon::MONO_DARK:
@@ -1597,18 +1601,11 @@ QIcon MainWindow::getSystrayIcon() const
     default:
         break;
     }
-#endif
-    QIcon icon;
-#if (defined(Q_OS_UNIX) && !defined(Q_OS_MAC))
-    if (Preferences::instance()->useSystemIconTheme())
-        icon = QIcon::fromTheme("qbittorrent");
 
-#endif
-    if (icon.isNull()) {
-        icon.addFile(":/icons/skin/qbittorrent22.png", QSize(22, 22));
-        icon.addFile(":/icons/skin/qbittorrent16.png", QSize(16, 16));
-        icon.addFile(":/icons/skin/qbittorrent32.png", QSize(32, 32));
-    }
+    QIcon icon;
+    icon.addFile(":/icons/skin/qbittorrent16.png");
+    icon.addFile(":/icons/skin/qbittorrent22.png");
+    icon.addFile(":/icons/skin/qbittorrent32.png");
     return icon;
 }
 

src/gui/options_imp.cpp

@@ -113,11 +113,10 @@ options_imp::options_imp(QWidget *parent):
   if (!QSystemTrayIcon::isSystemTrayAvailable()) {
     checkShowSystray->setChecked(false);
     checkShowSystray->setEnabled(false);
-  }
-#if (!defined(Q_OS_UNIX) || defined(Q_OS_MAC))
     label_trayIconStyle->setVisible(false);
     comboTrayIcon->setVisible(false);
-#endif
+  }
+
 #if defined(QT_NO_OPENSSL)
   checkWebUiHttps->setVisible(false);
 #endif