Nixpkgs diff

As a better alternative to this, I think we should finally implement input-aware formatting of lists/sets. Specifically to never contract lists/sets that are expanded onto multiple lines already.

We previously added this to the standard to make that possible:

The part of the standard you quote is taken out of context, this is a deliberate special case for bindings. IMO this sweeping approach of always expanding attributes is a net negative to the output layout, especially when attribute sets are non-last arguments to function calls.

Moreover, this misses several other similar inconsistencies which happen with lists.

The current rules have already been tweaked a lot, and I would strongly prefer an approach which refines them a bit more:

• Use prettyTermWide in prettyApp in contexts where prettyTermWide is already used (e.g. bindings)
• Expand the logic to also apply let binding bodies, in operator chains(?), and for lists

Implemented the above alternative here: #224

Closing in favor of the above alternative