allow_multiline_func doesn't account for init methods

[thibault-ml]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Describe the bug

The allow_multiline_func option in the opening_brace rule does not work for init methods.

Complete output when running SwiftLint, including the stack trace and command used

$ swiftlint lint
Linting Swift files in current working directory
Linting 'SomeClass.swift' (1/1)
/tmp/testswiftlintrule/SomeClass.swift:9:5: warning: Opening Brace Spacing Violation: Opening braces should be preceded by a single space and on the same line as the declaration. (opening_brace)
Done linting! Found 1 violation, 0 serious in 1 file.

Environment

• SwiftLint version: 0.42.0
• Installation method used: Homebrew
• Paste your configuration file:

opening_brace:
  allow_multiline_func: true

• Are you using nested configurations? No
• Which Xcode version are you using? Xcode 12.3

Sample code

// swiftlint:disable multiline_parameters_brackets indentation_width
/// Doc
public struct SomeClass {
    /// Doc
    public init(firstParameter: String,
                secondParameter: String,
                thirdParameter: String,
                fourthParameter: String)
    { // This DOES triggers a violation
        print("Hello world")
    }

    /// Doc
    public func someMethod(firstParameter: String,
                           secondParameter: String,
                           thirdParameter: String,
                           fourthParameter: String)
    { // This does NOT triggers a violation
        print("Hello world")
    }
}

[thibault-ml]

My guess is that this regex needs to include init, unless we have a better way to determine we're in init?

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. Please comment to prevent this issue from being closed. Thank you for your contributions!

[thibault-ml]

Mmh, this is not really stale unfortunately, it hasn't been fixed as far as I am aware.

[RaimundasSakalauskas]

I can confirm that this is still happening.