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SfGantt - QueryChartRowInfo Yields Inconsistent Results when EnableRowVirtualization is true

Hi,

I have observed some unusual behavior when using EnableRowVirtualization=true and QueryChartRowInfo.

Attached is a sample solution, video and screenshots that illustrate the problem.  There are two issues that I can see. 

  1. Once the number of rows exceeds the number that are to be virtualised, it appears that duplicate tasks are added to the end of the grid and you get a lot of flickering when scrolling.
  2. Once the number of rows exceeds the number that are to be virtualised and a custom class is added using QueryChartRowInfo, the application of the css class to the chart is unpredictable.

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