Bug 188471

Summary:	Tons of rendering artifacts with AC enabled in https://lichess.org
Product:	WebKit	Reporter:	Sergio Villar Senin <svillar>
Component:	WebKitGTK	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED DUPLICATE
Severity:	Critical	CC:	bugs-noreply, mcatanzaro
Priority:	P2
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
URL:	https://lichess.org

Description Sergio Villar Senin 2018-08-10 08:29:21 PDT

Steps to reproduce:

1- Goto https://lichess.org
2- Move the pointer around, hovering the various UI widgets in the page, also click on some menu (even start a game if you fancy)

Expected outcome:
Good rendering

Actual outcome:
Tons of rendering artifacts, a lot of stuff drawn on places where they should not be

Looked like the typical issue with AC, so I tried WEBKIT_DISABLE_COMPOSITING_MODE=1 and then everything works fine.

Comment 1 Sergio Villar Senin 2018-08-10 08:29:59 PDT

BTW I'm using the recently released 2.20.4

Comment 2 Michael Catanzaro 2018-08-10 09:19:39 PDT

If it's a regression from 2.20.3, then please mark this as a duplicate of bug #188377. Carlos Garcia will do a fixup release next week.

Comment 3 Sergio Villar Senin 2018-08-10 09:33:04 PDT

(In reply to Michael Catanzaro from comment #2)
> If it's a regression from 2.20.3, then please mark this as a duplicate of
> bug #188377. Carlos Garcia will do a fixup release next week.

I don't think it's a regression from 2.20.3 as I've seen it for a while now, like 3-4 months at least. I'll wait for next release and close it if it's really caused by the same change that fixed the other bug.

Comment 4 Michael Catanzaro 2018-08-10 17:27:20 PDT

No, it's a separate issue, then.

Comment 5 Sergio Villar Senin 2018-08-13 12:51:55 PDT

It turned out that 2.20.5 fixed this too, so the root cause was the same. Working fine now.

*** This bug has been marked as a duplicate of bug 188377 ***