Martin von Zweigbergk 5c703aeb03 cli: replace o as graph node by ● when using unicode graph ...

@joyously found `o` confusing because it's a valid change id prefix. I
don't have much preference, but `●` seems fine. The "ascii",
"ascii-large", and "legacy" graph styles still use "o".

I didn't change `@` since it seems useful to have that match the
symbol used on the CLI. I don't think we want to have users do
something like `jj co ◎-`.

2023-03-12 23:21:05 -07:00

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