ui: 0-qty market order(s) lurking in order book

[norwnd]

Saw 0-qty market order show up in order book (on master mainnet, view-only mode = without creating account). It disappears and reappears (the amount of orders it consists of changes from time to time, could be just 1 or could be 5 for example, qty stays at 0 though) after page refresh or navigating from/to /markets page:

0-qty-market-order-in-the-book.webm

I tried to shake it off restarting dexc 2-3 times, it didn't help (ghost orders are still there) which suggests the server is either fully responsible or heavily contributing (e.g. order book gets corrupted when client fetches it from server) to this issue.

Full log: 0-qty-market-order.txt. No errors in console, running just 1 dexc instance (no funny stuff with 2 instances interfering with each other).

Might have same root cause as #1543, could potentially be resolved (or addressed at least partially) by: norwnd#1 + norwnd#2 + norwnd#4

[chappjc]

Duplicate of #1929 which is also a dip of #1139

[chappjc]

Duplicate of #1929 which is also a dup of #1139

[buck54321]

It's not actually a zero-quantity market order. We combine the value of all market orders into that row, which should be hidden if the value is zero, but obviously have a bug.

[chappjc]

This one is due to cancel orders, unlike the depth chart issues you solved in #1543 @buck54321
Let's close this since it's a dup