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When frame content is scrolled, it is redrawn with artifacts. This can be reproduced in uast/demo/demo_widgets.p.

I am adding two cases to be fixed where P2J frame doesn't show scroll bars correctly.

(1)
testcases/uast/lastevent/lastevent_mouse_coords.p - the inner frame f2 must be scrollable (with its size set via the SIZE frame option).
Taken from #1782-124.

(2)

DEF FRAME f WITH SIZE 30 BY 10.
DEF VAR cb AS CHAR FORMAT "x(3)" VIEW-AS COMBO-BOX  LIST-ITEMS 
   "item1", "item2", "item3", "item4", "item5" SIZE 10 BY 5.

ENABLE cb WITH FRAME f SIDE-LABELS.
/* the frame must be scrollable at this point */
FRAME f:VIRTUAL-WIDTH = 100.
WAIT-FOR GO OF FRAME f.

This is probably another instance of the same issue in (1).

This is note 136 of #1782:

Another issue: after 2226a will be released, you will be able to use mouse events to see the location of i.e. a click event, in the scrolled frame. With scrollable frames, you will see that there are two other issues:

1. when scrolling, the scrollbar's thumb size increases when i.e. scrolled down
2. the scrolled amount doesn't match the frame's scrollable size: I've reached a point reported as 1000px on the Y axis...
3. the widgets are not drawn partially, when scrolled

All these can be seen in the lastevent/lastevent_mouse_coords.p test.