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Height overflow when adding large number of nodes #1260

@jin-x

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@jin-x

Hello.

When setting large number of nodes (e.g. 200 millions) then the value of NewHeight overflows in method TBaseVirtualTree.SetChildCount (look here). Because it have type TDimension = Integer (defined here). So list is fixed (doesn't move), vertical scroll bar is absent and exception occurs in Debug mode.

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