[RCS0034] Rule reports false positive on C# 12 Primary Constructors

[MaksHladki]

Product and Version Used

Roslynator Version: 4.14.1
IDE: Visual Studio 2022
Framework: .NET 8.0

Description

The analyzer RCS0034 (Put type parameter constraint on its own line) reports a warning even when the constraint is placed on a new line, specifically when using C# 12 Primary Constructors.
It seems the analyzer does not account for the primary constructor parameter list appearing between the class declaration and the where clause.

Steps to Reproduce

1. Create a class using C# 12 Primary Constructors with a generic type constraint.

public class MixedConstraintService<TKey, TValue>(TKey key, TValue value) where TKey : notnull where TValue : new()
{
    public TKey Key { get; } = key;
    public TValue Value { get; } = value;
}

2. Format the code so the where clause is on its own line (as required by RCS0034).

public class MixedConstraintService<TKey, TValue>(TKey key, TValue value)
    where TKey : notnull
    where TValue : new()
{
    public TKey Key { get; } = key;
    public TValue Value { get; } = value;
}

Expected behavior

The analyzer should not report a warning because the where constraint is already on its own line.

Actual behavior

The analyzer reports: warning RCS0034: Put type parameter constraint on its own line.
The CLI tool reports: Infinite loop detected: Reported diagnostics have been previously fixed.