Use separate icons for windows and linux

src/main/java/io/bitsquare/app/gui/BitsquareApp.java

@@ -26,6 +26,7 @@ import io.bitsquare.gui.components.Popups;
 import io.bitsquare.gui.util.ImageUtil;
 import io.bitsquare.persistence.Persistence;
 import io.bitsquare.user.User;
+import io.bitsquare.util.Utilities;
 
 import com.google.common.base.Throwables;
 
@@ -122,8 +123,17 @@ public class BitsquareApp extends Application {
         primaryStage.setScene(scene);
         primaryStage.setMinWidth(75);
         primaryStage.setMinHeight(50);
-        primaryStage.getIcons().add(new Image(getClass().getResourceAsStream(
-                ImageUtil.isRetina() ? "/images/window_icon@2x.png" : "/images/window_icon.png")));
+
+        // on windows the title icon is also used as task bar icon in a larger size
+        // on Linux no title icon is supported but also a large task bar icon is derived form that title icon
+        String iconPath;
+        if (Utilities.isOSX())
+            iconPath = ImageUtil.isRetina() ? "/images/window_icon@2x.png" : "/images/window_icon.png";
+        else
+            iconPath = "/images/taskbar_icon.png";
+
+        if (iconPath != null)
+            primaryStage.getIcons().add(new Image(getClass().getResourceAsStream(iconPath)));
 
 
         // make the UI visible

src/main/java/io/bitsquare/gui/SystemTray.java

@@ -42,8 +42,9 @@ public class SystemTray {
 
     private static final String ICON_HI_RES = "/images/system_tray_icon@2x.png";
     private static final String ICON_LO_RES = "/images/system_tray_icon.png";
-    private static final String ICON_ALT = "/images/system_tray_icon_alt.png";
-    
+    private static final String ICON_WINDOWS = "/images/system_tray_icon_windows.png";
+    private static final String ICON_LINUX = "/images/system_tray_icon_linux.png";
+
 
     private static final String SHOW_WINDOW_LABEL = "Show exchange window";
     private static final String HIDE_WINDOW_LABEL = "Hide exchange window";
@@ -82,8 +83,10 @@ public class SystemTray {
         String path;
         if (Utilities.isOSX())
             path = ImageUtil.isRetina() ? ICON_HI_RES : ICON_LO_RES;
+        else if (Utilities.isWindows())
+            path = ICON_WINDOWS;
         else
-            path = ICON_ALT;
+            path = ICON_LINUX;
 
         try {
             BufferedImage trayIconImage = ImageIO.read(getClass().getResource(path));