Pretty printer could use heuristics to detect pointless line breaks

[marijnh]

The most glaring example is

r =
    {some long expression that did not fit
     on a line};

... where the line break doesn't even create any space. But there are other situations, like

let foo =
    {multiline: record,
     literal: 100};

Here the literal would have fit just fine without the line break. We could probably make it not add the line break if the first line of the following block fits on a line. (Though that information is not currently being produced by the 'new' pretty-printer.)

[graydon]

This is too vague to act on in its current state. I'm sympathetic but it's unlikely to be fixed since the pp doesn't have this sort of information and we don't have any sort of algorithmic formulation of the terms involved. Reopen if you can figure something out.