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When following the recommended method for not having RowHeight also affect the Group Header height of using HasUnevenRows the performance of ListView takes a major hit (my list is only 3,000 items long).
My Recommended solution would be to match the iOS pattern of being able to specify a separate default header height from the default row height and by implementing that same mechanism under the hood, will eliminate the performance issue likely related to calculating the list height.
Thank you for the request