Re: [w3c/manifest] Control over webapp installation & launch (#705)

@mgiuca For the user experience, both have value, why was it implemented in Chromium/Firefox UI if not ?

You are probably right for the mobile plateform but it's not obvious for desktop.
During normal in-browser navigation, if you are used to go to a webapp (already installed) the only thing telling you it's installed is this icon in the address bar. 
But it's a new feature and most of the time, people don't look at the address bar zone except if they are searching for a specific known feature. So what is the discovering strategy? What if the desktop shortcut is removed?
If the user visit the webapp (in browser) and can see in a corner `hey, you already installed the app, use it! [open in app button]`, a click will open the "open with" tooltip (so he'll notice the new icon and discover the feature) and chose to open in app or cancel.

> I don't think we want sites to be able to constantly ask the user to switch into app mode

Visually, it could just replace the install button, same requirement (user gesture), same [design patterns](https://developers.google.com/web/updates/2019/06/pwa-install-patterns).

> if the user rejects switching into app mode once, does that mean they don't want to be asked again

It's not a permission but just a shortcut to open the "open with" tooltip. Webauthor don't even need to know if the user closed it.
It's the result of a user gesture, if they don't want to be asked again, they don't click.

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