Detect and log message for Unity users

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@2339 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/ui/tray/DavGatewayTray.java

@@ -234,6 +234,11 @@ public final class DavGatewayTray {
         );
 
         if (!Settings.getBooleanProperty("davmail.server")) {
+            if ("Unity".equals(currentDesktop)) {
+                LOGGER.info("Detected Unity desktop, please follow instructions at " +
+                        "http://davmail.sourceforge.net/linuxsetup.html to restore normal systray " +
+                        "or run DavMail in server mode");
+            }
             // first try to load SWT before with Java AWT
             ClassLoader classloader = DavGatewayTray.class.getClassLoader();
             try {