[Lazarus] Visual "uglyness" when creating TSynEdit @ runtime in my app

[Martin]

On 05/01/2013 11:43, luiz americo pereira camara wrote:
> If I single step, it is not painted by that line.
>
> It happens here
>
>        Perform(CM_SHOWINGCHANGED, 0, 0); // see TWinControl.CMShowingChanged
>
> This ends with TWin32WSWinControl.ShowHide that calls SetWindowPos
> which should not trigger a immediate wm_paint
>
> What OS are you using?

Win Vista 32 bit
>
> Did you tried commenting the code inside TWin32WidgetSet.ShowScrollBar?
>

No, I single stepped, and checked, when the paint happened.