no documentation or help on conjoined bug tasks

[Martin Pool]

Launchpad has some nonobvious rules about how multiple bug tasks interact, but this is not documented publicly afaics. (See eg bug 425465.)

wgrant: poolie: Did you work out bug #425465, or want an explanation? There are two bugs there, as you suspect.
ubottu: Launchpad bug 425465 in malone "cannot target series bugtask to a milestone?" [Undecided,New] https://launchpad.net/bugs/425465
poolie: wgrant: it's not actually blocking me atm but i'd still like an explanation
wgrant: poolie: So, there is the icon vs. text bug, as you said.
wgrant: In fact, there are three bugs.
12:40
wgrant: There's the bug that the non-AJAX links are bad for productseries tasks -- they point to the product task directly.
wgrant: And then there's the bug that +editstatus renders for conjoined slaves.
wgrant: Renders, but then crashes on submission.
wgrant: Are you aware of the conjoined task rules?
poolie: wgrant: the last is the most serious for me
wgrant: poolie: The last is meant to be broken, just in a more obvious way.
poolie: wgrant: not really, i'm aware there are some but ... this ui is not making it clear how they're meant to be working
12:45
poolie: i can see that the trunk task should be coupled to the overall bug status or something
poolie: however, this happens even when i try to target what i think of as the supplementary task
wgrant: Right.
wgrant: That's the second bug I mentioned.
wgrant: If you can invoke the AJAX, it should work fine.
wgrant: You just have to find the right bit of the link to hit.
wgrant: (a conjoined slave cannot be edited directly. a product task is a conjoined slave iff the bug also has a non-WONTFIX'd task for the product's development focus series. in that case, anything linking to the product task's +editstatus needs to be hit with a cluebat.)
12:50
poolie: i don't suppose this is documented other than in wgrant? :)
wgrant: poolie: No, it's not documented anywhere except the code and IRC logs.