Run the emulator launch test (on emulator or emulator-kk doesn't matter). If you try the test on any of the top row apps (calendar, camera, clock, costcontrol) they are launched as expected and the test works fine. Try the test on the second row of apps (communications/contacts, communications/dialer, email, fm) and nothing at all is launched and the test times out (at priming). Try the test on the third row of apps (gallery, music, settings, sms) then the app immediately above the expected one is launched instead so the test fails out at priming since the wrong app is launched. Doesn't happen on device. I've just been testing with the top row of apps for a long time so I don't know how long this problem has existed for.

The rowHeight is off for some reason. Output with debug when trying to launch app on 2nd row (dialer). No app launches so test hangs at priming. https://gist.github.com/rwood-moz/8b0ec1b1fe726b12a936

Comment on attachment 8572650 [details] Link to Github pull-request: https://github.com/mozilla-b2g/raptor/pull/18 R+ lgtm and works great. Tested by running the launch test on all of the apps, on the emulator as well as the device and ensured the correct app was primed and launched each time. Tested mainly on emulator and not emulator-kk because of bug 1139428 (but on emulator-kk the correct app was selected also).

Comment on attachment 8572780 [details] [gaia-node-modules] eliperelman:bug-1138074 > mozilla-b2g:master Carrying over r+ for package bump.

Comment on attachment 8572782 [details] [gaia] eliperelman:bug-1138074 > mozilla-b2g:master Carrying over r+ for package bump.

Try run: https://treeherder.mozilla.org/#/jobs?repo=gaia-try&revision=fa5db2e40236 In master: https://github.com/mozilla-b2g/gaia/commit/c10f89fef5414dabd816ccb44a584d65267a01fa