For example on piwik.org/demo for 1st of March, the keyword "piwik" appears twice in the report.
This is not due to trailing spaces as the keywords are trimmed (see core/Tracker/Visit.php line 710).
This could be due to encoding issue or other special characters.
(In ) - cleaning up the search engine parsing code, adding tests, recording UTF8 keywords in the DB rather than encoded (as tables are now utf8, refs #5730)
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