Error: Promise did not implement oncancel

[alexlamsl]

Issue Type: Bug

• open VSCode via Command Prompt
• observe the following stacktrace

[main 7:20:31 PM] update#setState idle
WARNING: Promise with no error callback:undefined
Error: Promise did not implement oncancel
    at n.Class.derive._oncancel._cancelAction (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:90:565)
    at Object.enter (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:86:441)
    at n.Class.derive._oncancel._run (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:88:719)
    at n.Class.derive._oncancel.cancel (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:87:904)
    at Object.enter (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:86:272)
    at n.Class.derive._creator._run (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:88:719)
    at n.Class.derive._creator.cancel (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:87:904)
    at n.Class.derive._creator._cancelAction (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:88:967)
    at Object.enter (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:86:441)
    at n.Class.derive._creator._run (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:88:719)
    at n.Class.derive._creator.cancel (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:87:904)
    at C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:157:704
    at Object.dispose (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:33:849)
    at C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:157:1013
    at Array.forEach (native)
    at e.dispose (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:157:973)
    at C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:160:611
    at e.fire (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:103:764)
    at WebContents.r (C:\Program Files\Microsoft VS Code\resources\app\out\vs\code\electron-main\main.js:109:201)
    at emitOne (events.js:101:20)
    at WebContents.emit (events.js:191:7)

It is an intermittent issue, i.e. not reproducible every time.

VS Code version: Code 1.25.1 (1dfc5e5, 2018-07-11T15:43:53.668Z)
OS version: Windows_NT x64 10.0.14393

Extensions: none

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• "no provider for" error when adding/replacing a workspace folder using a custom FileSystemProvider (#51088)
• Most intellisense/autocomplete does not work anymore (#52689)
• myTree.reveal error when hightlighting multiple lines (#51771)
• Error: Can't run recursive splices. (#50083)
• Clearing search text from the Extension search box results in Cannot read property 'reasonId' of undefined (#50884)

[alexlamsl]

Sometimes I get this instead:

[main 7:28:28 PM] update#setState idle
You should really not try to cancel this ready promise!

[kieferrm]

@alexlamsl what you see is leaking from #53526. As we go through all of our code, you won't see those anymore.