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Searching for ucastnik should highlight účastník
Searching for ucastnik should highlight účastník - in other words when case sentisitivity is disable in search it should also take special Czech and Slovak characters as case insensitive.
č = c, ď = d, ô = o and so on.
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Diacritics don't have anything to do with case sensitivity. But I do agree that a diacritics-stripping search could be handy. That would have to be locale dependent, since diacritics work differently in different languages.