By default, the filter compares values as they appear in the data source. For example, if you are looking for values that contain the string "fac", you will find "factory" but not "façade".
If you set this property to true, the filter will remove any diacritics before performing the comparisons. In this case, looking for the string "fac" will return both "factory" and "façade".
This property is especially useful in applications localized for languages that contain many accents, such as French, Spanish, Portuguese, etc.