proposed API change on ChangeManager

[Yuan Gao]

hi,

For JIRA 1761 (https://issues.apache.org/jira/browse/TRINIDAD-1761), we 
propose to add this API to the ChangeManager interface:
  /**
   * Replace an AttributeComponentChange if it's present.
   *
   * @param facesContext
   * @param uiComponent
   * @param attributeComponentChange
   * @return the old change instance
   */
  public AttributeComponentChange 
replaceAttributeChangeIfPresent(FacesContext facesContext,
    UIComponent uiComponent,
    AttributeComponentChange attributeComponentChange);

Let me know what do you think about it.

Thanks,
-Yuan