:gerard-majax Reporter
	Description • 9 years ago

User-Agent: Mozilla/5.0 (Mobile; rv:41.0) Gecko/41.0 Firefox/41.0

This was not present on a master build from Thursday evening but is on one from Friday evening.

STR :
 - open a web page
 - scroll down or up

Expected:
 content scrolls smoothly

Actual:
 content jumps under the finger

Reproduced at least on Z3 Compact.

Attached is logcat while the issue was just reproduced.

	:gerard-majax Reporter
	Comment 2 • 9 years ago

[Blocking Requested - why for this release]: Web content is not browsable is sane conditions. The regression is recent, let's find the cause and backout ...

	[:fabrice] Fabrice Desré
	Comment 3 • 9 years ago

I also reproed with b2gdroid running on other devices.

Exemple of test pages: http://mobile.lemonde.fr, any instagram picture page.

	[:fabrice] Fabrice Desré
	Comment 4 • 9 years ago

One more thing: flings are ok in my tests. What fails is when you keep the finger on screen to pan up and down.

Kats, has anything landed recently around that?

	Kartikaya Gupta (email:kats@mozilla.staktrace.com) Assignee
	Comment 5 • 9 years ago

Maybe regressed by bug 1169690.

	Doug Sherk (:drs) (inactive)
	Comment 6 • 9 years ago

Please try backing out bug 1169690 before doing a regression window to save time.

	:gerard-majax Reporter
	Comment 7 • 9 years ago

(In reply to Kartikaya Gupta (email:kats@mozilla.com) from comment #5)
> Maybe regressed by bug 1169690.

Reverted locally, works much better ...

	Kartikaya Gupta (email:kats@mozilla.staktrace.com) Assignee
	Comment 8 • 9 years ago

For me backing out bug 1169690 locally doesn't fix the issue.

	[:fabrice] Fabrice Desré
	Comment 9 • 9 years ago

That didn't fix it on b2gdroid either.

	Botond Ballo [:botond]
	Comment 10 • 9 years ago

I also tested this, and while I see the jumping issue, backing out bug 1169690 doesn't fix it for me, either. It looks like something else caused the regression.

	Botond Ballo [:botond]
	Comment 11 • 9 years ago

(Also, it would be very surprising if bug 1169690 had anything to do with this: it should affect nothing but fling acceleration.)

	Kartikaya Gupta (email:kats@mozilla.staktrace.com) Assignee
	Comment 12 • 9 years ago

Using m-c tinderbox builds I narrowed it down to http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=5b4c240e1a36&tochange=0496b5b3e9ef

	Botond Ballo [:botond]
	Comment 13 • 9 years ago

(In reply to Kartikaya Gupta (email:kats@mozilla.com) from comment #12)
> Using m-c tinderbox builds I narrowed it down to
> http://hg.mozilla.org/mozilla-central/
> pushloghtml?fromchange=5b4c240e1a36&tochange=0496b5b3e9ef

Maybe bug 1162064?

	Kartikaya Gupta (email:kats@mozilla.staktrace.com) Assignee
	Comment 14 • 9 years ago

Looks like it. Inbound range came down to https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=4ed228a6c759&tochange=227d356ac030

	David Anderson [:dvander] - inactive, e-mail if emergency
	Comment 16 • 9 years ago

Comment on attachment 8616731 [details] [diff] [review]
Patch

Review of attachment 8616731 [details] [diff] [review]:
-----------------------------------------------------------------

Out of curiosity do know what is asking for a TabChild's APZ status without it having a pres shell? (Does that just mean it hasn't been fully initialized yet, or it has been torn down?)

	Kartikaya Gupta (email:kats@mozilla.staktrace.com) Assignee
	Comment 17 • 9 years ago

It's during initialization, at [1].

[1] http://mxr.mozilla.org/mozilla-central/source/dom/browser-element/BrowserElementChild.js?rev=970957a8ad2a#49

	Pulsebot
	Comment 18 • 9 years ago

https://hg.mozilla.org/integration/mozilla-inbound/rev/91a114e1ea73

	Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)
	Comment 20 • 9 years ago

https://hg.mozilla.org/mozilla-central/rev/91a114e1ea73

	Pi Wei Cheng [:piwei] (inactive)
	Comment 23 • 9 years ago

This issue is verified fixed on Flame 2.5 Master. Scrolling web pages now appears smooth without jumpiness.

Device: Flame
BuildID: 20150708043645
Gaia: 553e4e281d11500bea702918841f011bfb5405f7
Gecko: 9b902b7669ae
Gonk: a4f6f31d1fe213ac935ca8ede7d05e47324101a4
Version: 42.0a1 (2.5 Master) 
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:42.0) Gecko/42.0 Firefox/42.0