[stable30] fix(files): virtual scroller item size computation #49561
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Pulled from #49432
Regression from #46681
Padding in grid mode is to be accounted twice :)
![image](https://private-user-images.githubusercontent.com/14975046/391065234-b22161c7-5259-47ca-ae6e-24f55765c0f7.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.orxRHwZ23M6RKVOyKi9T5sbX5EUzm7TyKmbTILn3vZM)