Default to SW mode when accessing app as PWA

[Jaifroid]

Fixes #808 and #801. Basically a one-liner, but formatted as two for legibility 😊.
EDIT: It will be interesting to see what effect this has on the secure browser tests...

[Jaifroid]

Interesting that all tests passed. I was expecting the secure browser tests to fail due to differences between jQuery and SW mode, but clearly the differences are immaterial. That's good.

[mossroy]

Good idea, even if directly accessing the PWA is not the main usage

[mossroy]

Interesting that all tests passed. I was expecting the secure browser tests to fail due to differences between jQuery and SW mode, but clearly the differences are immaterial. That's good.

That's very interesting.
Do we have a way to check which mode has been used by each browser from the UI tests logs?
Based on https://caniuse.com/mdn-api_serviceworker, it should use jQuery mode for Edge 15, and SW mode for all other ones (as IE11 does not run these tests at all)

[Jaifroid]

That's very interesting. Do we have a way to check which mode has been used by each browser from the UI tests logs? Based on https://caniuse.com/mdn-api_serviceworker, it should use jQuery mode for Edge 15, and SW mode for all other ones (as IE11 does not run these tests at all)

I think it might depend on whether we can see the console output in the tests snapshots. If they are running in a secure context and the browser is capable of supporting SW mode, they should launch in SW mode with this PR.

[Jaifroid]

So I guess this is ready to merge. I've tested on Firefox & Edge Chromium from localhost. You have to reset the app to see what it defaults to when there is no contentinjectionmode key in the localStorage. In both browsers it defaults to SW mode. In IE11 of course it remains in jQuery mode after a reset (what I mean is, it doesn't attempt and fail to load SW mode).

[mossroy]

OK for me