Allow formatter to keep blank lines

[toellrich]

The formatter currently always removes blank lines. It would be great if, just like with the XML editor (see attached screenshot), it would be configurable to keep blank lines.

.

[de-jcup]

The formatting/pretty printing is done by snake yaml parser.

AFAIKS when looking at
https://bitbucket.org/snakeyaml/snakeyaml/wiki/Documentation snake does not provide an option to keep blank lines.

So it would be necessary to create a workaround here - like done for comments (which are always dropped by snake).

[toellrich]

If it's too much of a hassle, don't worry about it. It's not a big deal. I just think that the blank lines improve readability and IntelliJ keeps them which would mean that team members who use different IDEs would produce differently formatted YAML files.

[de-jcup]

New preference entry

With last commit you have a new preference entry (per default the "Clear all blank lines" is disabled like in IntelliJ)

An example

Origin

Formatted with "Clear blank lines" disabled

Formatted with "Clear blank lines" enabled (old behaviour)

[de-jcup]

@toellrich : Just release 1.9.0 on eclipse marketplace - so feature is available now.