Hide zero balance tokens with preference

[darkwing]

Fixes: #10165

I've been seeing a lot of requests for this, and I myself would love it, so I threw this together. I'm not sure if we had previous design for this so apologies if we did.

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[Gudahtt]

So the request here is to automatically hide tokens with zero balance?

Note that we already allow the hiding of any token manually, and we don't automatically add tokens unless we detect that a token on our list has a non-zero balance. So it seems like this would be a convenience of marginal benefit, unless I'm missing something?

[darkwing]

Reasons I would want to be able to toggle this:

1. From an investor perspective, I think it's nice to be able to show and hide tokens I have owned in the past, regardless of current balance.
2. From an investor perspective, I would still like to see individual transaction data, regardless of if I have any balance now
3. Automatically hiding tokens may be a bit jarring to existing users, so having this as an option would prevent UX shock. If it really does come down to users wanting that, we can simply default this to true

[Gudahtt]

I see, so the main advantage for you over manually hiding tokens would be that this is temporary , and allows you to untoggle this to see your old transaction history if you want to. Does that sound about right?

[darkwing]

Bingo. Since we don't have a "transactions" view, thus no way to see transactions for a given token (other than telling users to go check out Etherscan) if we auto-hide zero balances, we should probably give this as an option to the user. I'm happy to hear what the rest of the team thinks though.

[jacobc-eth]

I think the UX that @darkwing is proposing here is superior to other proposals we've seen that all create problems where the user can't find those tokens once they have balance in the future. @rachelcope could you take a look when you have a sec?

[darkwing]

Tokens.mp4

[darkwing]

Ledger does this via a setting as well:

[Gudahtt]

LGTM!

[rachelcope]

Looks good to me!