997290 - [B2G][Task Manager]After launching task manager from homescreen to close all apps, the empty task manager cannot be loaded

Status: RESOLVED FIXED

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

Description

[Ross Kuhlman ([e-mail])]

Attachment: CantLaunchEmptyTaskManager.txt

The task manager can be launched when no apps are open, and it will display the text "No recent apps".  However, the device can enter a state in which this empty task manager will not open. If the user is viewing the homescreen, launches the task manager, and closes all apps, they will not be able to relaunch the task manager while it is empty.

When attempting to launch the task manager in this state, the device will vibrate, but the task manager will not appear. As soon as an app is opened, the Task Manager will function normally again.

Repro Steps:
1) Update a Buri to BuildID: 20140416040204
2) Launch any app.
3) Tap home button to return to homescreen.
4) Long press home button to launch task manager.
5) Close all open apps.
6) Return to homescreen.
7) Long press home button.

Actual:
Device vibrates, but otherwise does nothing.

Expected:
Task manager is launched. User is informed that no apps are open.

Master M-C Environmental Variables:
Device: Buri Master M-C MOZ
BuildID: 20140416040204
Gaia: 3d4b4b06475d2376bad23ac46da185cd48a68d17
Gecko: dd50745d7f35
Version: 31.0a1
Firmware Version: v1.2-device.cfg

Notes:
Seems like a relatively minor issue because it only affects the task manager when no apps are open, but it could also be confusing for new users.

Repro frequency: 100%
See attached: logcat

Comment 1

[Jason Smith [:jsmith]]

1. Can we get a video of this bug?
2. Does this happen on 1.4?

Comment 2

[Tony Nguyen]

The issue does not reproduce on the latest Buri v1.4 mozRIL BuildID: 20140416000203. 'No recent apps' will display on screen when bringing up the Task Manager a second time.

Gaia: 441c4bcd8ac4f8c01a9bc5a2f8d64eaa87844803
Gecko: a559848a8a00
Version: 30.0a2
Firmware Version: v1.2-device.cfg

URL for Master M-C: http://youtu.be/nez89MSMUnk

Comment 3

[Tony Nguyen]

B2G Inbound Regression Window-

Last Working:
Environmental Variables:
Device: Buri Master M-C mozRIL
BuildID: 20140324205840
Gaia: befb78cce80144ba6c0783aefcf6b98439d0a8e9
Gecko: d70ec036c4f4
Version: 31.0a1
Firmware Version: v1.2-device.cfg

First Broken:
Environmental Variables:
Device: Buri Master M-C mozRIL
BuildID: 20140324215141
Gaia: 5c0b52751c7cf9f73d44126916a822baf65e2547
Gecko: 3a109b7a9f65
Version: 31.0a1
Firmware Version: v1.2-device.cfg

Last Working Gecko First Broken Gaia - Issue does reproduce
Gaia: 5c0b52751c7cf9f73d44126916a822baf65e2547
Gecko: d70ec036c4f4

Last Working Gaia First Broken Gecko - Issue does not reproduce
Gaia: befb78cce80144ba6c0783aefcf6b98439d0a8e9
Gecko: 3a109b7a9f65

Gaia Pushlog: https://github.com/mozilla-b2g/gaia/compare/befb78cce80144ba6c0783aefcf6b98439d0a8e9...5c0b52751c7cf9f73d44126916a822baf65e2547

Comment 4

[Jason Smith [:jsmith]]

Caused by bug 961800.

Alive - Can you take a look?

Comment 5

[(inactive after 6/18) Alive Kuo [:alive]]

Taken

Comment 6

[Ivan Tsay (:ITsay)]

Plus this regression bug.

Comment 7

[(inactive after 6/18) Alive Kuo [:alive]]

Attachment: https://github.com/mozilla-b2g/gaia/pull/18636

The position -1 of the stack is invalid so we have this issue.
Instead of doing that in cardsview I prefer to do that on app window manager.

A hot patch after bug 916709 applied.

Comment 8

[Etienne Segonzac (:etienne)]

Comment on attachment 8411709 [details] [review]
https://github.com/mozilla-b2g/gaia/pull/18636

r=me with the small dead code removed

Comment 9

[(inactive after 6/18) Alive Kuo [:alive]]

https://github.com/mozilla-b2g/gaia/commit/d92d42dca27237aeb108fc501c3f2bedb1e63e41