Lint to use curly bodies for statements except one-line ifs (Style Guide).

[pq]

Migrated from dartbug.com/22001:

Should warn or fix if a for, while, or else clause does not have a curly brace body. It should also flag the then clause of an if if it doesn't fit on a single line.

[seaneagan]

Does this issue include a "quick fix" to convert overlong one-line if statements to block statements?

[pq]

I've been treating lint warnings and fixes as separate requests but maybe we should consolidate. In any event, your comment is timely because my current focus is getting the linter plugged into the analysis server which is the key to getting fixes implemented (#87) . Stay tuned!

[pq]

My sense is this one is largely subsumed by curly_braces_in_flow_control_structures which is enabled in package:pedantic.

We can re-open if anyone feels strongly otherwise...