[Lazarus] TsWorkshetGrid isn't scrolling enough

[Werner Pamler]

> I have 96 dpi, but I use Windows classic as thema.
> When  I switch to Windows 7 Basic, the grid works fine.

No luck, I switched to Win-Classic design, stll works fine. Since 
TsWorksheetGrid is a modified LCL TCustomDrawGrid and IIRC does not 
change anything with respect to scrolling I suspect that the bug is in 
grids.pas. Could you please run the attached demo. It is like your own 
demo but replaces the TsWorksheetGrid by a standard TStringGrid. On my 
system, this demo behaves correctly as well.


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