I'm not a skilled UI designer, so I suspect there may be even better
options, but it's definitely already better than the raw ASCII "---" we
had before.
Put the line only at the beginning because it looks bad if the line
after the label is misaligned when labels don't have the same width
(e.g. "Remote" vs. "Local" in the divergence view).
I've optimised for muscle memory backwards compatibility here:
- Outside interactive rebase: press 'f' then instead of a confirmation
panel, a menu appears where you can choose to keep the selected commit's
message
- Inside interactive rebase: press 'f' then press 'c' to see the menu
for keeping the message, where if you press 'c' again it will retain the
current message. so 'fcc' is the chord to press.
We're also now showing the -C flag (which is what enables the behaviour)
against the todo.
I've picked the 'c' keybinding because 'C' was taken and it corresponds
to the flag. Previously that showed a warning about a change in
keybinding for cherry picking but it's been ages since we've made that
change so I'm happy to retire it.
