• VSCode Version: Code - Insiders 1.11.0-insider (01091bb, 2017-03-10T07:05:03.565Z)
• OS Version: Darwin x64 16.4.0

Steps to Reproduce:

1. Provide a long running (or infinite) promise to window.showQuickPick
2. See the quick pick with the progress indication
3. Press esc to cancel the quick pick
4. Visibly the quick pick goes away, but window.showQuickPick doesn't return
5. Expected that window.showQuickPick would return as soon as it was cancelled

Also if you provide an infinite promise (never resolves) window.showQuickPick never returns at all not matter what happens next (other quick picks are shown, etc)