method_argument_space: allow separating arguments with empty lines

[raveren]

Feature request

https://cs.symfony.com/doc/rules/function_notation/method_argument_space.html

In method arguments and method call, there MUST NOT be a space before each comma and there MUST be one space after each comma. Argument lists MAY be split across multiple lines, where each subsequent line is indented once. When doing so, the first item in the list MUST be on the next line, and there MUST be only one argument per line.

This definition allows for empty lines between the two subsequent parameters. Illustrated:

$pageFilters->add(
    Filters\Text::create(/* */),

    Filters\Dropdown::create(
        'user_id',
        /* ... */
    ),

    Filters\Dropdown::create(
        'location_id',
        /* ... */
        /* ... */
        /* ... */
    ),
);

IMHO this is a valid, readable way to format variadic function parameters. It's especially useful for more complex ones as they become visually distinct from each other, and that allows cursory scan of the parameters to quickly find the one you need - or to determine the amount of passed parameters, and their order.

However, there is no existing configuration that would allow that, php-cs-fixer removes the empty lines between Filters definitions:

$pageFilters->add(
    Filters\Text::create(/* */),
    Filters\Dropdown::create(
        'user_id',
        /* ... */
    ),
    Filters\Dropdown::create(
        'location_id',
        /* ... */
        /* ... */
        /* ... */
    ),
);

Thanks for reading and consideration, here's a racoon for your trouble:

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