Fix container algebra on diffs (#9263)
Fix container algebra on diffs (#9263)

Fix when elements of the container are too big and rendered in different lines, the separator is missing.

References #9259
michalmuskala/elixir,ggcampinho/elixir,kelvinst/elixir,pedrosnk/elixir,lexmag/elixir,kimshrier/elixir,pedrosnk/elixir,ggcampinho/elixir,kimshrier/elixir,kelvinst/elixir,lexmag/elixir,elixir-lang/elixir,joshprice/elixir