Don't consume trailing newlines as part of layouts (#74)

[tek]

• Additionally, using left-associative precedence for lambda case causes brace layouts to fail

I'm a bit surprised this just works. However, one test failed after the fix, which is the one that uses \r instead of \n. Solved it by adding \r to the extras. This doesn't seem right to me, can you take a look and check if you can spot anything wrong here, @414owen ?

cc @wenkokke

PS finally used those edit tests for something, pretty neat :relaxed:

[tek]

ah well. if it works, it works.