Fix formatting issues around for loops

[elachlan]

Actual behavior

Code generated with for loops seem to be indented and formatted incorrectly.

Expected behavior

Code should be generated with correctly formatted for loops.

Repro steps

1. NativeMethods.txt content:

PAINTSTRUCT

2. NativeMethods.json content (if present):

3. Any of your own code that should be shared?

Issue is in WhitespaceRewriter.

Context

• CsWin32 version: [e.g. 0.4.422-beta]
• Win32Metadata version (if explicitly set by project):
• Target Framework: [e.g. netstandard2.0]
• LangVersion (if explicitly set by project): [e.g. 9]

[elachlan]

In the example screenshot, is there supposed to be braces, or is this a single line?

[AArnott]

No braces are generated in the syntax tree because it was only one statement. But if it makes it easier to fix, I have no objection with you adding braces around the statement in the syntax tree.