Re: [w3c/manifest] Update manifest spec to consider manifest updates for icon urls to be cache-control:immutable (PR #1199)

@Dp-Goog commented on this pull request.



> @@ -1792,6 +1792,13 @@ <h3>
             `name_localized`.
             </li>
           </ol>
+          <p>

> User agents MAY consider an icon unchanged if the user agent determines the visual difference is insignificant.

I thought this was an implementation detail of Chromium and not to be speced. This was also not proposed in the explainer, does it make sense to spec it? I applied your changes nonetheless, kept this as an open question.

> Spec is binding, and our implementation also considers icons if any of them change.

Same question as above, I thought this was an implementation detail and not something we have proposed in the explainer, which [only suggests icon url changes](https://github.com/WICG/manifest-incubations/blob/gh-pages/predictable-app-updating.md#proposal). Should we still spec it according to implementation? 

> IDK if we need to mention cache-control immutable

Imo, it might be nicer to keep the explainer, PRD and the spec say the same thing. It makes it easier to follow the chain of research and understand why it was kept that way. Wdyt?

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