Generally, this feature should only be supported immediately after the text was committed, not after the user performed other operations on the text. When the feature is not supported, return null.
The input method may provide a list of attributes that it is interested in. In that case, information about other attributes that the implementor may have need not be made accessible through the iterator. If the list is null, all available attribute information should be made accessible. @param attributes a list of attributes that the input method isinterested in @return the latest committed text, or null when the "Undo Commit"feature is not supported
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