1157936 - [Scrolling][Scroll Bar]The scroll bar is choppy and jumpy when scrolling on any screen with a scroll bar

Status: RESOLVED FIXED

(Core :: Layout, defect)

Description

[Derek Harris [:DerekH] - Dont need info. Last day 6/5/15]

Attachment: Scrolling Logcat

Description:
If the user is on a screen where the scrollbar appears, the scrollbar will move jittery and jump across the screen. The scrolling animation is choppy and highly noticable


Repro Steps:
1) Update a Flame to 20150423010203
2) Scroll up and Down on the homescreen
3) Observe the scrollbar


Actual:
Scroll bar scrolling is choppy


Expected:
Scroll bar scrolls smoothly up and down

Environmental Variables:
Device: Flame 3.0 (319mb)(Kitkat)(Full Flash)
Build ID: 20150423010203
Gaia: 9d4f756aa35cb7f030a92f3c1f65fb55254ddd1d
Gecko: 0b202671c9e2
Gonk: b83fc73de7b64594cd74b33e498bf08332b5d87b
Version: 40.0a1 (3.0)
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:40.0) Gecko/40.0 Firefox/40.0


Repro frequency: 10/10
See attached: Logcat, Video - https://youtu.be/69ZFdySKL8o

Comment 1

[Derek Harris [:DerekH] - Dont need info. Last day 6/5/15]

This issue does NOT occur on Flame 3.0 (512mb Memory), or Flame 2.2

Scroll bar scrolls smoothly up and down

Environmental Variables:
Device: Flame 3.0 (512mb)(Kitkat)(Full Flash)
Build ID: 20150423010203
Gaia: 9d4f756aa35cb7f030a92f3c1f65fb55254ddd1d
Gecko: 0b202671c9e2
Gonk: b83fc73de7b64594cd74b33e498bf08332b5d87b
Version: 40.0a1 (3.0)
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:40.0) Gecko/40.0 Firefox/40.0

Environmental Variables:
Device: Flame 2.2 (319mb)(Kitkat)(Full Flash)
Build ID: 20150421002501
Gaia: 828dd03a0e3b140d74b2e49355197df4d91d9227
Gecko: 36f72a3efb9b
Gonk: ebad7da532429a6f5efadc00bf6ad8a41288a429
Version: 37.0 (2.2)
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:37.0) Gecko/37.0 Firefox/37.0

Comment 3

[Peter Bylenga [:PBylenga]]

[Blocking Requested - why for this release]:
Performance regression.

Requesting a window.

Comment 4

[Markus Stange [:mstange]]

We're fairly confident that this was caused by bug 1148515.

Comment 5

[Brogan Zumwalt [Inactive]]

Mozilla-Inbound Regression Window:

Markus' hypothesis in comment 4 appears to be correct

Last working Mozilla-Inbound build:
Device:  Flame 3.0
BuildID: 20150421142413
Gaia: 0645bbed4d6cbd8064652eebafe011edc3e417fd
Gecko: df384f61363a
Version: 40.0a1 (3.0)
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:40.0) Gecko/40.0 Firefox/40.0

First broken Mozilla-Inbound build:
Device: Flame 3.0
Build ID: 20150421144810
Gaia: 0645bbed4d6cbd8064652eebafe011edc3e417fd
Gecko: 80518fa5c0d6
Version: 40.0a1 (3.0)
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:40.0) Gecko/40.0 Firefox/40.0


Working Gaia with Broken Gecko issue DOES reproduce:
Gaia: 0645bbed4d6cbd8064652eebafe011edc3e417fd
Gecko: 80518fa5c0d6

Working Gecko with Broken Gaia issue does NOT reproduce:
Gaia: 0645bbed4d6cbd8064652eebafe011edc3e417fd
Gecko: df384f61363a


Mozilla-Inbound Pushlog:
http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=df384f61363a&tochange=80518fa5c0d6


Issue appears to have been caused changes made in bug 1148515

Comment 6

[KTucker [:KTucker][Inactive 3/4/2016]]

Markus, can you take a look at this please? The landing for bug 1148515 looks to be the cause here.

Comment 7

[Markus Stange [:mstange]]

Attachment: patch

Duh.

Comment 8

[Pulsebot]

https://hg.mozilla.org/integration/mozilla-inbound/rev/762d5d1fcc07

Comment 9

[Carsten Book [:Tomcat]]

https://hg.mozilla.org/mozilla-central/rev/762d5d1fcc07