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Frozen rows and columns + virtual scroll + filtering: inconsistent number of rows

Hello,

We have noticed, that in the grid with following features used together: 
- virtual scroll, 
- frozen rows,
- filtering,
- remote/async data source

when user provides filter predicate causing number of records <= number of frozen rows, then number of rows rendered by contentModule is inconsistent.

This can be reproduced on following demo: 

https://stackblitz.com/edit/qqxb5x-ne28pz?file=index.ts,index.html

Please observe console log:

  1. Initially there is 22 rows rendered (correct)
  2. Filter is applied (to search for single row)
  3. dataBound event is emitted with 1 row (correct)
  4. grid.refresh() is called
  5. dataBound event is emitted with 0 rows (INCORRECT!)