[w3c/manifest] Feature: Open shortcuts on the already open app (#937)

Right now, if I have my PWA open and I use a shortcut defined on the manifest, the OS opens a new window/app/instance of the same app, but in the correct state based on the shortcut.
I would like to setup shortcuts in order to only open one instance of the app, and if I select another shortcut, that command is sent to the existing browser frame instead of opening a new top-level app,

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https://github.com/w3c/manifest/issues/937