6857360: NimbusLAF: Menu indicator looks ugly with RTL orientation.

Reviewed-by: rupashka

src/share/classes/javax/swing/plaf/nimbus/NimbusIcon.java

@@ -84,6 +84,8 @@ class NimbusIcon extends SynthIcon {
                         translatex = 1;
                     }
                 }
+            } else if (c instanceof JMenu) {
+                flip = ! c.getComponentOrientation().isLeftToRight();
             }
             if (g instanceof Graphics2D){
                 Graphics2D gfx = (Graphics2D)g;

src/share/classes/sun/swing/MenuItemLayoutHelper.java

@@ -718,10 +718,10 @@ public class MenuItemLayoutHelper {
     }
 
     private void alignRect(Rectangle rect, int alignment, int origWidth) {
-        if (alignment != SwingUtilities.LEFT) {
+        if (alignment == SwingConstants.RIGHT) {
             rect.x = rect.x + rect.width - origWidth;
-            rect.width = origWidth;
         }
+        rect.width = origWidth;
     }
 
     protected void layoutIconAndTextInLabelRect(LayoutResult lr) {