ex unit diff bug

[dkuku]

Elixir and Erlang/OTP versions

Today I spotted a strange diff in my tests.
One element of a list was missing but the diff highlights more elements.
Tested on main.

Operating system

linux

Current behavior

 assert [:b, :c, :d] == [:a, :b, :c, :d]
assert [:b, :c] == [:a, :b, :c]

Expected behavior

I don't expect the last element to be highlighted.

[josevalim]

Agreed:

iex(3)> List.myers_difference ~c"bcd", ~c"abcd"
[ins: ~c"a", eq: ~c"bcd"]

[josevalim]

Fixed by #14275.