Diff : wrong management of $ref comparison

[LasneF]

given the test below

    left := `openapi: 3.0
components:
  schemas:
    Yo:
      type: int
    OK:
      $ref: '#/components/schemas/Yo'`

    right := `openapi: 3.0
components:
  schemas:
    Yo:
      type: int
    OK:
      type: int'`

is set as breaking whereas to me should not

an approach would be to manage the diff after resolving the $ref so that it compares consistant definitive data
this would also match the refactoring use case where some item are moved , factorized and so on

[daveshanley]

This has been resolved in v0.15.0

Test cases can be found here: https://github.com/pb33f/libopenapi/blob/main/what-changed/model/schema_test.go#L2861