Support single line pretty-printed JSON output

[Marcono1234]

Problem solved by the feature

When users know in advance that the JSON data to write is rather small, but they still want increased readability, they might not want line breaks but a space after , and :. For example:

{"a": [1, 2, 3], "b": true}

Even with the upcoming FormattingStyle (#2231) this is currently not possible. See also slightly related discussion in #2327 (comment).

Feature description

Extend FormattingStyle with a setting withSpaceAfterSeparator(boolean) (or similar):

• true: always add a space after :, and in case the newline value of the style is empty, also add a space after ,
• false: don't add a space after : and ,

Note: This has no effect on the newline value of the style. If the newline is not empty it will still be added after , and no space will be added after the ,, regardless of the withSpaceAfterSeparator value.

Alternatives / workarounds

None?

But maybe this use case is not common enough to justify adding a new FormattingStyle method.