1. Find the little "Source" link and click it.
2. Find the "Browse" link, which is in a little toolbar right under the other little toolbar, next to the (less relevant) "Changes" and "Clones" links, which look visually near-identical.
3. In most (but not all) projects, hunt down the word "trunk" in tiny 13px text, and click it to see the main development branch.
Compare to GitHub or BitBucket, which just show you the damn code.
(Yes, I know you were joking, but I've been wanting to rant about this UI failure for a while now. And don't even get me started on Launchpad.)
After five years or whatever of being tricked into clicking Launchpad links, I just noticed the other day that they have a "source" link on the top left corner. I had no idea they actually displayed source code. I always thought it was some crappy bug reporting product. Who knew?
Hah. Got you, it's also a crappy project-hosting product, a crappy code-hosting product, a crappy code review product and a crappy FQA/Q&A product. And an acceptable translation product (not as good as Transifex, but it's free, bit it requires using the rest of that crap).
That's a pretty low bar to set though.
> and it handles bugs that affect multiple projects really well
Kind-of, changing the project set (outside of adding projects to an existing bug) might be impossible (same with in-project "series" — its code for branches), until fairly recently the role of some statuses was very unclear (and I'm still not entirely sure of their actual use), one of the links is essentially useless and — as everywhere else in launchpad — text formatting is completely non-existent (without even talking about richer data sets, such as adding screenshots to bug reports which falls under "add attachment or patch").
Multi-project and multi-branch tracking are nice, but they're limited and they don't make the tracker much friendlier.