1382767 - Some Twitter avatar images shift up and down while scrolling the page

Status: RESOLVED FIXED

(Core :: Graphics, defect)

Description

[Chris Peterson [:cpeterson]]

@ Jonathan, could this bug be a regression from your fix for ProcessRestyledFrames bug 1378219?

STR:
1. Load this series of tweets: https://twitter.com/pablohidalgo/status/888090530420322305
2. Wait for the page to finish loading.
3. Slowly scroll down the page.
4. Watch the tweets' avatar images.

RESULT:
About one-third of way down the page, the avatar images (starting with user "BOB") start shift up and down. Some have black graphics artifacts.

I think this is a recent regression in Nightly 56, but I had a hard time finding a regression range with mozregression. This is a possible regression range:

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=dece50457378ac4934afe9fb3c2a8054e8894588&tochange=0985725c848ec0cfc6f2f3c3a5aa3d71321e7620

Comment 1

[Jonathan Kew [:jfkthame]]

(In reply to Chris Peterson [:cpeterson] from comment #0)
> @ Jonathan, could this bug be a regression from your fix for
> ProcessRestyledFrames bug 1378219?

I can't seem to reproduce the problem described (with latest Nightly on OS X), but I'd be surprised if it were a result of bug 1378219. Particularly with the mention of "black graphics artifacts", it sounds to me more like an issue in gfx-land than layout-land.

Comment 2

[Mike Taylor [:miketaylr]]

Chris, possibly dupe of 1305744?

Comment 3

[Chris Peterson [:cpeterson]]

(In reply to Mike Taylor [:miketaylr] (55 Regression Engineering Owner) from comment #2)
> Chris, possibly dupe of 1305744?

I don't think this is a dupe of bug 1305744. That bug shows the user's own large avatar image scrolling at a different speed than the page, but the problem I see is black graphics glitches in the small avatar images on other users' tweets.

Comment 4

[Mike Taylor [:miketaylr]]

Gotcha, thanks.

Comment 5

[Sotaro Ikeda [:sotaro]]

I wonder if the bug is related to Bug 1381666.

Comment 6

[Sotaro Ikeda [:sotaro]]

:cpeterson, how do you think about comment 5?

Comment 7

[Chris Peterson [:cpeterson]]

Good catch. I think this bug is probably the same issue as bug 1381666. I will retest after 1381666 is fixed.

Comment 8

[Milan Sreckovic [:milan] (needinfo for best results)]

Bug 1381666 is fixed in the latest nightly.  Does this still happen?

Comment 9

[Chris Peterson [:cpeterson]]

(In reply to Milan Sreckovic [:milan] from comment #8)
> Bug 1381666 is fixed in the latest nightly.  Does this still happen?

Nope. This bug is fixed!