dartfmt doesn't like 'if' flow control statements without blocks (FIXED)

[Hixie]

The following code is easy to read: you have three clear conditions (t=0, t=1, and other), and in each case you can clearly see that it sets value.

      if (t == 0.0)
        value = begin;
      else if (t == 1.0)
        value = end;
      else
        value = lerp(t);

The formatter turns it into:

      if (t == 0.0) value = begin;
      else if (t == 1.0) value = end;
      else value = lerp(t);

...which isn't as readable.

A similar case:

    if (direction == AnimationDirection.forward || reverseCurve == null)
      return curve;

Formatter says:

    if (direction == AnimationDirection.forward ||
        reverseCurve == null) return curve;

...which is nowhere near as readable.

Here's a case where it's better to go over the 80 char limit than try to wrap (see #450):

      if (outputSize.width / outputSize.height > sourceSize.width / sourceSize.height)
        destinationSize = new Size(sourceSize.width * outputSize.height / sourceSize.height, outputSize.height);
      else
        destinationSize = new Size(outputSize.width, sourceSize.height * outputSize.width / sourceSize.width);

Currently the formatter turns that into:

      if (outputSize.width / outputSize.height >
          sourceSize.width / sourceSize.height) destinationSize = new Size(
          sourceSize.width * outputSize.height / sourceSize.height,
          outputSize.height);
      else destinationSize = new Size(outputSize.width,
          sourceSize.height * outputSize.width / sourceSize.width);