Extensions double click: Promise did not implement oncancel

[bpasero]

Steps to Reproduce:

1. double click an extension from the extension viewlet
2. check the console:

Error: Promise did not implement oncancel
    at Promise_ctor._cancelAction (winjs.base.raw.js:1654)
    at Object.enter (winjs.base.raw.js:805)
    at Promise_ctor._run (winjs.base.raw.js:1068)
    at Promise_ctor.cancel (winjs.base.raw.js:964)
    at Promise_ctor._oncancel (cache.js:21)
    at Promise_ctor._cancelAction (winjs.base.raw.js:1652)
    at Object.enter (winjs.base.raw.js:805)
    at Promise_ctor._run (winjs.base.raw.js:1068)
    at Promise_ctor.cancel (winjs.base.raw.js:964)
    at _Base.Class.derive._creator._cancelAction (winjs.base.raw.js:1311)

[joaomoreno]

Can you still repro this? Doesn't happen over here.

[bpasero]

Yes:

[joaomoreno]

Still cannot reproduce. Show me tomorrow.