comparison framework/Document.h @ 697:a27a6113fdd7

Restore/reimplement cancelAsyncLayerCreation - I had forgotten Tony uses it

     LayerCreationAsyncHandle createDerivedLayersAsync(const Transforms &,
                                                       const ModelTransformer::Input &,
                                                       LayerCreationHandler *handler);
 
     /**
+     * Indicate that the async layer creation task associated with the
+     * given handle should be cancelled. There is no guarantee about
+     * what this will mean, and the handler callback may still be
+     * called.
+     */
+    void cancelAsyncLayerCreation(LayerCreationAsyncHandle handle);
+
+    /**
      * Delete the given layer, and also its associated model if no
      * longer used by any other layer.  In general, this should be the
      * only method used to delete layers -- doing so directly is a bit
      * of a social gaffe.
      */