Re: [w3c/manifest] Support a way to update explicilty (#446)

What is the logic a user agent should apply to decide if the installation of one manifest is actually a new install or an update/replacement of an existing one? It would seem that this should be related to scope but I'm not sure if that's explicitly defined anywhere?

Put differently, why would you say this?

> we want to be able to show what's changed and give the end-user a chance to review or dismiss the update. 

If I visit the same URL a week apart I get no warnings that the content has changed since the last time I visited?

If the "effect" of a manifest is limited to functions that will not impact security or privacy then the normal controls for managing those risks should suffice surely?



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