Re: [w3c/manifest] Add installation prompt control flow (#417)

> I see, so you're saying that you can call prompt many times and it will just return a bunch of promises, all of which get resolved at the same time?

Yep. 

> Can't we just have prompt() always return the same promise? In effect, it just returns the userChoice promise that we used to have as an attribute. Then surely we don't need a queue.

You are probably right - but I need to check what the WebIDL binding layer does. I thought the call would need to return a new object for some reason. 

> To have both promises succeed, but ... to have the second prompt fail. Does that sound OK?

This one could just resolve with the results of whatever "Click install" was. That would still adhere to only being able to actually `prompt()` once: you just a promise that immediately resolves to whatever "Click install" resulted with.  



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