build id: 1999051708 platform: red hat linux 5.2 the problem: if you go to the above URL, and use the arrow keys to scroll up and down in the document, the lines of text overwrite themselves and make a big mess. this happens at plenty of other pages as well, eg macintouch.com.

Bug 6014 seems to be a duplicate of this one. It seems to show up both in viewer and apprunner. Anyway, I've seen this problem too when embedding NGLayout and using the nsIScrollableView::ScrollTo() method to scroll around the page. The scrolled in region is not redrawn, and if i call mWebShell->Repaint(1) after the ScrollTo call it gets drawn, but also scrolled up a bit. I tracked the ScrollTo call a bit, and i found that nsScrollableView::ScrollTo has a #if 0 segment (at line 1288) that if #if 1'ed makes keyboard navigation work the same way as scrollTo + Paint. That is: no junk is left, but the page first scrolls down and then up a bit.

Added alex@signum.se to cc-list

i think this is a pixley bug.

this seems to be fixed now (tested on Mac and akkana tested on Linux).

yup VERIFIED with the 1999100518 build (Linux)