6.3.0: Non-idempotent output with long lines and ternary operator

[jrose-signal]

The following input (reduced from generated code, don't blame me)

struct Outer {
    func test() {
        let ffiStructKeepAlive: (FixedByteArrayConverter<FixedByteArrayHelper15>.KeepAlive?, IdentityConverter<Int32>.KeepAlive?, )? = (media_id_keepalive != nil || cdn_keepalive != nil || false) ? (media_id_keepalive, cdn_keepalive,) : nil
    }
}

formats to

struct Outer {
    func test() {
        let ffiStructKeepAlive:
            (FixedByteArrayConverter<FixedByteArrayHelper15>.KeepAlive?, IdentityConverter<Int32>.KeepAlive?, )? =
                (media_id_keepalive != nil || cdn_keepalive != nil || false) ? (media_id_keepalive, cdn_keepalive,)
                : nil
    }
}

but if you run it through the formatter again you get

struct Outer {
    func test() {
        let ffiStructKeepAlive:
            (FixedByteArrayConverter<FixedByteArrayHelper15>.KeepAlive?, IdentityConverter<Int32>.KeepAlive?, )? =
                (media_id_keepalive != nil || cdn_keepalive != nil || false)
                ? (media_id_keepalive, cdn_keepalive,)
                : nil
    }
}

Our .swift-format:

{
    "version": 1,
    "lineLength": 120,
    "indentation": { "spaces": 4 },
    "indentConditionalCompilationBlocks": false,
    "lineBreakBeforeEachArgument": true,
    "lineBreakBetweenDeclarationAttributes": true,
    "prioritizeKeepingFunctionOutputTogether": true
}