It's not so much the total number of commits that matters here, it's just
whether we are on the first one. (This includes the other condition.)
This allows us to get rid of the condition in rebase.go.
We already have this very convenient behavior of jumping to the next stageable
line after staging something. However, while this worked well for staging
single lines or hunks, it didn't work correctly when staging a range of lines;
in this case we want to start searching from the first line of the range.
While we try to keep the view's cursor position in sync with the context state's
selectedLineIdx (at least when pressing up or down), there are enough situations
where the two run out of sync; for example when initially opening the view, or
after staging a hunk, or when scrolling the view using the wheel. While it would
be possible to fix these situations to keep them always in sync, it doesn't seem
worth it, because the view's cursor position isn't really used for anything
else. So we rather special-case the SelectedLine/SelectedLineIdx functions of
ViewDriver to query the context state's selectedLineIdx directly if it is a
patch explorer context.
For users who have the rebase.autoSquash git config set to true, any regular
rebase will squash fixups in addition to rebasing. Not good -- we'll fix that in
the next commit.
A global ~/.gitconfig file can have influence on how integration tests behave;
in my case, I had the option "merge.conflictStyle" set to "diff3", which made
the integration test "cherry_pick_conflict" fail because the diff was different
from what the test expected.
Make this more robust by telling git to ignore the global config file when
running tests.
