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

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

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

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

Caused by bug 961800. Alive - Can you take a look?

Taken

Plus this regression bug.

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 on attachment 8411709 [details] https://github.com/mozilla-b2g/gaia/pull/18636 r=me with the small dead code removed