411665 - Ugly flash of scrolling in this case when programmatically scrolling 2 times to different points

Status: NEW

(Core :: Layout, defect)

Description

[Martijn Wargers (dead)]

Attachment: scrollintoview(false) testcase

Now that bug 332246 is fixed, you can see some ugly flash of scrolling with the mentioned url.
This is actually correct behavior, because the script on that page asks to scroll at 2 different points (which Mozilla didn't do when bug 332246 wasn't fixed yet).

But maybe there can be done something about it, by doing scrolling asynchronous or something?
(it also would help if painting would be not as slow on trunk, branch seems faster)

Comment 1

[Martijn Wargers (dead)]

Attachment: scrollintoView(true) testcase

Btw, IE and Opera also show this flash of scrolling on the testcases and the url, so it's not necessarily incorrect. But especially with Opera, you almost don't notice it, because it seems to paint very fast or something.

This testcase shows that this is something that always happens, also for older Mozilla builds (Mozilla1.7).

Comment 2

[Robert O'Callahan (:roc) (email my personal email if necessary)]

Can you put the testcase in a loop to use as a gfx performance test? Maybe we can speed that up.

We can support asynchronous scrolling with compositor post-1.9, but definitely not for 1.9.

Comment 3

[Martijn Wargers (dead)]

It might be more or less related to bug 379834.