"Map internals of models" code fix does not appear on extension methods

[TonySkorik]

Describe the bug The "Map internals of models" code fix does not appear under the lightbulb menu when called on an extension method.

To Reproduce Steps to reproduce the behavior:

1. Add a static instance method

   private static SomeOutputModel
       MapToResponse(SomeInputModel source)
   {}

2. Observe that the lightbulb contains map internals of models code fix.
3. Add this qualifier to the first formal parameter of the added method

   private static SomeOutputModel
       MapToResponse(this SomeInputModel source)
   {}

4. Observe that the lightbulb does not contain "Map internals of models" code fix.

Expected behavior The map internals of models code fix should appear under the lightbulb menu when called on an extension method with compatible signature.

Screenshots Extension method behavior

Behavior when this qualifier is removed from first formal parameter

Desktop:

• OS: Windows 10
• Rider version and build number 2022.3.3 Build #RD-223.8836.53, built on March 20, 2023