TRichView.com

I'm trying to achieve the effect named as "typewriter scrolling", which keeps the caret in a fixed vertical position.

I used OnChange event and calculated the delta needed to correct the scrolling point using ScrollBy, but then I get some repainting glitches (visible paragraphs appear repeated two/three times inside the control).

Is there an easy way to get this effect?

Do not use ScrollBy.
Use ScrollTo (and please read "Scrolling in RichView" topic in the help file, it explains limitations of vertical scrolling)