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Changes between Initial Version and Version 1 of Ticket #2809, comment 17

initial	v1
1	1	- unchecking a filter results in the wrong number of remaining and total rows displayed in the filter preview
	2	- filtering is quite slow (takes ~7 seconds on my machine to remove 15k rows after filtering) - this problem also exists in the trunk version of the DataPreprocessing)
2	3
3		- filtering is quite slow (takes ~7 seconds on my machine to remove 15k rows after filtering) - this problem also exists in the trunk version of the DataPreprocessing)
	4	EDIT:
	5	The slowness is caused by the calls to `IList.RemoveAt()` which is called in succession for each row that needs to be removed inside the `PreprocessingData.DeleteRow()` method. Simply replacing the original values with the filtered values (instead of by row removal) results in a massive speed improvement.