On dashboard, collapse uninteresting communities

[cellio]

meta:294770

This is a narrower change while waiting for #1323. The dashboard takes a lot of space to show a community that the reader might not be interested in (full list of categories for each, plus logo). Order can't currently be changed (it's by age), but can we add a way for users to "unpin" (collapse and deprioritize) ones they don't care about and persist that state? I'm imagining a "collapse" icon next to each entry, which collapses that community to a single label with the name and moves it to the bottom of the list. It's ok if the move doesn't happen until the next page load. Collapsed communities should have an icon to do the reverse -- expand and restore to its original position (move can wait for reload).

On page load, we'd show all of the expanded (normal state) communities in their current order followed by the collapsed views of all the unpinned ones, again in deterministic order. Ultimately we want user-controlled ordering that applies everywhere communities are listed, so this is a stopgap -- but because the dashboard entries are large particularly on a phone, I'd like to do some sort of stopgap if we can.

[trichoplax]

Before someone starts work on this, I'd like to see a complexity assessment of both this and #1323. It isn't obvious to me that this would be significantly quicker or easier than implementing ordering.

[trichoplax]

It might be worth considering whether this change would still be wanted after #1323 is implemented. If so, it's worth doing this one first, but if not, the additional work might be better spent on going straight to implementing ordering.

[cellio]

Thanks for raising that. I had been assuming that 1323 (the end goal) would be a lot harder, but if not, there's no point in doing this interim work. Let's assess 1323 and then decide what to do with this one.