[gwt-contrib] Flip DisclosurePanel image in RTL

[jlabanca]

Reviewers: Ray Ryan,

Description:
The arrow in the DisclosurePanel images isn't flipped in RTL, but it
should be.  I added the flipRtl ImageOption and verified it worked in
Showcase.

Please review this at http://gwt-code-reviews.appspot.com/89802

Affected files:
   user/src/com/google/gwt/user/client/ui/DisclosurePanel.java


Index: user/src/com/google/gwt/user/client/ui/DisclosurePanel.java
===================================================================
--- user/src/com/google/gwt/user/client/ui/DisclosurePanel.java (revision  
6514)
+++ user/src/com/google/gwt/user/client/ui/DisclosurePanel.java (working  
copy)
@@ -26,6 +26,7 @@
  import com.google.gwt.event.shared.HandlerRegistration;
  import com.google.gwt.resources.client.ClientBundle;
  import com.google.gwt.resources.client.ImageResource;
+import com.google.gwt.resources.client.ImageResource.ImageOptions;
  import com.google.gwt.user.client.DOM;
  import com.google.gwt.user.client.Element;
  import com.google.gwt.user.client.Event;
@@ -56,6 +57,7 @@
      FiresDisclosureEvents, HasWidgets, HasAnimation,
      HasOpenHandlers<DisclosurePanel>, HasCloseHandlers<DisclosurePanel> {
    interface DefaultImages extends ClientBundle {
+    @ImageOptions(flipRtl = true)
      ImageResource disclosurePanelClosed();

      ImageResource disclosurePanelOpen();



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