Details
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Bug
 - 
    Resolution: Won't Fix
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Major
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    None
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    1.1.1
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    None
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    WebSphere Community Edition, HSQLDB
 
Description
When selecting two versions in history and clicking on "Compare selected Versions" the resulting pages does not show the diff but $xwiki.diff.getDifferencesAsHTML($text1, $text2 ,false) instead.
The log says:
10:44:52,804 INFO  [SimpleLog4JLogSystem] Null reference [template '', line 152, column 1] : $xwiki.diff.getDifferencesAsHTML($text1, $text2 ,false) cannot be resolved.