MultiStepInput in QuickInput doesn't work

VS Code Version
Version: 1.32.3 (user setup)
Commit: a3db5be9b5c6ba46bb7555ec5d60178ecc2eaae4
Date: 2019-03-14T23:43:35.476Z
Electron: 3.1.6
Chrome: 66.0.3359.181
Node.js: 10.2.0
V8: 6.6.346.32
OS: Windows_NT x64 10.0.17134

I was attempting to navigate the sample as the preview.gif, but as soon as I choose an option from the first step quickPick, the second step inputBox did not show up.

While debugging, I placed a breakpoint on the line for this.current.show() in the MultiStepInput.showInputBox method. The breakpoint would get hit, and I would hit resume. The second step would then show up - though trying to focus on it would cause it to fail.

So I put console logs in to see what might be happening and got the following output.

While the inputBox appears to show - it is hidden immediately. As a shouldResume is set, it looks like it is awaiting the results of that, though it never completes (as an example stub - neither resolve nor reject is called).

If I set the ignoreFocusOut the window stays, but doesn't have focus - which is of course not an ideal user experience.

If I cause shouldResume to resolve to true - then I see the inputBox get created, hidden immediately, and created again - focus isn't an issue this time, but cancelling via Esc is.

Using the breakpoint trick to get the next window to stay, and using the Chrome/Electron Developer Tools window I can see that document.activeElement is correctly set to the input field in the inputBox, but when I attempt to set focus to the window the focus shifts to body.monaco-shell:

I've attached a copy of the modified multiStepInput.ts for reference.
multiStepInput.zip