Re: [PATCH] rebase -i -p: doesn't pick certain merge commits that are children of "upstream"

On 11-06-18 1:12 PM, Stephen Haberman wrote:

...I can think of cases where personally I'd want to only move
around commits on the first-parent line, e.g. even in the case of
"rebase-i-p A1", to have less noise (C1 and any others on its branch)
in the todo, but at that point it sounds like I'm projecting behavior
onto rebase-i-p that isn't actually there.

Yes, it would definitely be useful to be able to do that.  In fact, 
there's a somewhat relevant expect-failure-test t3404.18 that is testing 
for that.  Like you said, we need a way to express topology in the todo 
list, which I'm not sure what a good representation is.