syntax: comments aren't spaced when following parentheses

[mvdan]

Discussed in https://github.com/mvdan/sh/discussions/838

^{Originally posted by **antichris** April 3, 2022} Is there a specific design reason why the space preceding a comment is removed when it follows an open parenthesis, or is it by accident? Given the input ```sh #!/bin/sh foo() { ## (bar, [baz]) : } ## qux corge() ( ## (grault, [garply]) : ) ## waldo _=$( ## lorem ipsum : ) ## dolor sit amet ``` `shfmt` yields ```sh #!/bin/sh foo() { ## (bar, [baz]) : } ## qux corge() (## (grault, [garply]) : ) ## waldo _=$(## lorem ipsum : ) ## dolor sit amet ```