Can't add picture to post (Both gallery and camera) via Twitter

[Hao Li]

$ system-image-cli -i
current build number: 57
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.en
last update: 2015-07-10 02:04:41
version version: 57
version ubuntu: 20150709
version device: 20150709-8965e37
version custom: 20150709-814-6-40

Reproduce steps:
1,Sign in twitter via twitter application where apps scops
2,Tap on the tweet button
3,Tap on the camera icon
4,Select the gallery or camera to add photo to post

Expect Result:
It's can be add photo to post successfully

Actual Result :
Can't add picture to post (Both gallery and camera) via Twitter

[Alexandre Abreu (abreu-alexandre)]

Confirmed, I could repro this on r58/arale

[Alexandre Abreu (abreu-alexandre)]

A case of "use after free", caused by the same Done() function in the FilePicker being called twice. The gist of the issue (besides the use after free) is the timer used in the webapp-container/webbrowser-app to circumvent app lifecycle issues.

[dinamic (dinamic6661)]

same on meizu / r3 (stable)

[Alexandre Abreu (abreu-alexandre)]

To be noted that I cannot deproduce it on r94 on arale (for twitter).

This statement does not invalidate the branch above, since it makes things better given the context of the crash (use-after-free) and the bug is timing sensitive, as does the branch associated with this bug

https://bugs.launchpad.net/webapps-core/+bug/1403089

which removes the source of the issue entirely.

[Alexandre Abreu (abreu-alexandre)]

I added a webbrowser-app branch that is related to that bug and remove the context in which the issue can be triggered.

At this point, I cannot repro the issue anymore, but since it is timing sensitive it is not gone. The 2 branches above remove the risk of it coming back.

[dinamic (dinamic6661)]

seems to work now on arale r4