Fix indentation of the closing quotes of a multiline string literal in a variable assignment

[paul-dingemans]

Description

Fix indentation below:

val bar = """
    some text
         some more text
"""

to

val bar = """
    some text
         some more text
    """

However, above might be a debatable choice. Therefore I left following TODO in a test:

        // TODO: What is the proper way to place the opening and closing quotes of a multi line string value? Note that
        //  the actual content of the multi line string is never been changed as required by ktlint maintainers
        //     val foo =
        //        """
        //        line1
        //        line2
        //        """
        //  or
        //     val foo = """
        //        line1
        //        line2
        //        """
        //  or
        //     val foo = """
        //     line1
        //     line2
        //     """
        //  or
        //     val foo = """
        //        line1
        //        line2
        //     """
        // First option would be most in line with function parameter. Second option is also acceptable. Third option
        // (previous behavior) is not logical as there is no continuation kind of indent visible. Last option is not in
        // sync with function parameter.

I would like your opinion about it, so that I can finalize this PR.

Checklist

• tests are added
• CHANGELOG.md is updated

[paul-dingemans]

Replaced with #1262