WIP: Naive approach on content sync

[juliusknorr]

First attempt to tackle #256

• Currently uses the lastModified date to detect changes with polling
• Optionally sent current server time with responses (can be avoided when switching to etags)

UI wise we currently don't trigger an update of the user interface to avoid ui element that are changing places without user interaction, so instead a small banner is shown that the view is outdated which allows the user to trigger a refresh manually. cc @nextcloud/designers Does that make sense? I guess ideally we could just update all data that doesn't affect any item position changes. So a card reordering would still trigger the banner while simple label or text changes would be shown immediately in the UI.

Possibly better approaches

• Use https://github.com/nextcloud/push once available
• Block updates and detect changes on ETag mismatch (Caching-Options via REST-API #1650 Exclusive write access #925)
  • https://fideloper.com/etags-and-optimistic-concurrency-control

[dodedodo]

UI wise we currently don't trigger an update of the user interface to avoid ui element that are changing places without user interaction

I feel like this should be optional. Situations arise where collaborative team meetings trigger a lot of overdue workflow updates. It's useful to actually see these changes being made in real-time (or within seconds).

[juliusknorr]

UI wise we currently don't trigger an update of the user interface to avoid ui element that are changing places without user interaction, so instead a small banner is shown that the view is outdated which allows the user to trigger a refresh manually. cc @nextcloud/designers Does that make sense? I guess ideally we could just update all data that doesn't affect any item position changes. So a card reordering would still trigger the banner while simple label or text changes would be shown immediately in the UI.

@jancborchardt Any input on this?

[juliusknorr]

🏓 @jancborchardt :)

[honzapatCZ]

How is this going? This could be real usefull.
I think there could be like switch between announcement to refresh and auto refresh.

[juliusknorr]

Closing for now, to be reopened when continuing, to get the list of open prs a bit more sorted.