1173165 - [SHB] A 2-pixel gray line of artifact appears on top edge of screen after doing some actions

Status: RESOLVED DUPLICATE of bug 1161549

(Firefox OS Graveyard :: Gaia::System::Window Mgmt, defect)

Description

[Pi Wei Cheng [:piwei] (inactive)]

Attachment: screenshot of issue (I put it over a black background so it's easier to see)

Description:
I don't have an 100% reproduction STR for this issue, but I've seen it enough times and it has been bothering me so I decided to write it up.

With SHB enabled, sometimes returning to Homescreen from an app will cause a gray line to show on top edge of screen. It looks kind of like the blue notification bar after it has been collapsed to a thin line, except for this line it is gray.

STR (not 100% repro, and can be encountered in other ways):
1) Enable Software Home Button in Settings
2) Press Power & Volume Down buttons to create a screenshot
3) Pull down the notification tray, and pull it up again, to make the blue line on top of screen go away
4) Open Clock app, switch to Timer tab, and start a 1 minute timer
5) Press Home button

Expected: Nothing weird shows up on top edge of screen

Actual: Sometimes a gray line will appear on top edge. If not, go back to Clock app and return Home again. See screenshot of issue. The line will remain on screen until you open another app.

There is another way to tell whether the bug will occur which seems to have a much higher repro rate: substitute step 5 to long pressing Home button to enter card view. If a gray line appears as you long-press the Home button, the bug will occur.

Device: Flame (KK, full flashed, 319MB)
BuildID: 20150609081840
Gaia: ea27c4ed5b6083c9e21d233d4804372ac4d5d353
Gecko: e10e2e8d8bf2
Gonk: 040bb1e9ac8a5b6dd756fdd696aa37a8868b5c67
Version: 41.0a1 (3.0 Master) 
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:41.0) Gecko/41.0 Firefox/41.0

Comment 1

[Pi Wei Cheng [:piwei] (inactive)]

I have also seen this issue on Aries, adding tag.

2.2 is also affected.

Device: Flame 2.2
BuildID: 20150609081832
Gaia: 06edb0f8db7c2f45cde54401a8593663059861a4
Gecko: 239c59921129
Gonk: bd9cb3af2a0354577a6903917bc826489050b40d
Version: 37.0 (2.2) 
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:37.0) Gecko/37.0 Firefox/37.0

----------

2.1 is unaffected. I can't get the gray line to appear no matter what I do.

Device: Flame 2.1
BuildID: 20150609081402
Gaia: f8b848c82d1ed589f7a1eb5cc099830c867ff1d4
Gecko: 35e91d3657f5
Gonk: bd9cb3af2a0354577a6903917bc826489050b40d
Version: 34.0 (2.1) 
Firmware Version: v18D-1
User Agent: Mozilla/5.0 (Mobile; rv:34.0) Gecko/34.0 Firefox/34.0

Comment 2

[Pi Wei Cheng [:piwei] (inactive)]

Note: Steps 1 to 3 are more like prerequisites/preconditions of this bug.

Comment 3

[Brogan Zumwalt [Inactive]]

B2G-Inbound Regression Window:

Last working B2G-Inbound build:
Device: Flame 3.0
Build ID: 20150409045834
Gaia: af26b7b017c3d727233da1abc916923af75454ef
Gecko: b534d2562e78
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 B2G-Inbound build:
Device: Flame 3.0
Build ID: 20150409065332
Gaia: eaf69e651e19b98c096f8e63b9829fb31df50927
Gecko: 6af4dd60911b
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 NOT reproduce:
Gaia: af26b7b017c3d727233da1abc916923af75454ef
Gecko: 6af4dd60911b

Working Gecko with Broken Gaia issue DOES reproduce:
Gaia: eaf69e651e19b98c096f8e63b9829fb31df50927
Gecko: b534d2562e78


B2G-Inbound Pushlog:
https://github.com/mozilla-b2g/gaia/compare/af26b7b017c3d727233da1abc916923af75454ef...eaf69e651e19b98c096f8e63b9829fb31df50927


Issue appears to have been caused by changes made in bug 1100332

Comment 4

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

Alberto, can you take a look at this please? This looks to have been caused by the work done for bug 1100332.

Comment 6

[Pi Wei Cheng [:piwei] (inactive)]

NI myself to check whether 1172050 actually fixed this bug.

Comment 7

[Pi Wei Cheng [:piwei] (inactive)]

I can no longer see this on today's Flame or Aries.

Comment 8

[Pi Wei Cheng [:piwei] (inactive)]

I am seeing this issue again on recent builds on Aries. Haven't gotten around to figure out an STR though...

Comment 9

[Pi Wei Cheng [:piwei] (inactive)]

Filed bug 1196827 for what I observed at comment 8