Generated swagger/redoc page doesn't respect inherited descriptions

[senketsu03]

Consider writing an abstract class/interface and adding summary to a method like so:

/// <summary>
/// Add user to database
/// </summary>
/// <param name="user">User to add</param>
/// <remarks>
///
/// Minimal request:
///
///     POST /users
///     { }
///
/// </remarks>
public Task<ActionResult<User>> PostUserAsync(User user);

Implementing it method with all needed attributes works as expected, but the docs are not visible on swagger/redoc pages, even when <inheritdoc/> is added.

I've also tried experimenting with writing sharable API in form of library/nuget package. Let's say it has a complete controller in this library:

/// <summary>
/// User controller
/// </summary>
[ApiController]
[ApiConventionType(typeof(DefaultApiConventions))]
[Route("/users")]
public class UserController : ControllerBase
{
    private readonly Context _context;

    public UserController(Context context) => _context = context;

    /// <summary>
    /// Get user from database by id
    /// </summary>
    /// <param name="id">User's id</param>
    /// <returns>User or response state</returns>
    [HttpGet("{id}")]
    [Produces(MediaTypeNames.Application.Json)]
    public async Task<ActionResult<User>> GetUserAsync(int id)
    {
        var user = await Library.GetUserAsync(_context, id).ConfigureAwait(false);

        if (user is null)
            return BadRequest(new ProblemDetails { Detail = $"Object with id={id} doesn't exist" });
        else
            return Ok(user);
    }
}

Then, referencing this library from webapi server will show all referenced controllers and methods on a swagger page, but again -- they lack documentation

[gfoidl]

I created #48982 -- let's discuss that over there.