FragmentMatcher warning

[helfer]

Print a warning when the heuristic fragment matcher is used on an interface or union fragment condition.

TODO:

• Make sure all of the significant new logic is covered by tests
• Rebase your changes on master so that they can be merged easily
• Make sure all tests and linter rules pass
• Update CHANGELOG.md with your change
• Add your name and email to the AUTHORS file (optional)
• If this was a change that affects the external API, update the docs and post a link to the PR in the discussion

[mdebbar]

Looks like this condition is never true. Can you confirm @helfer?

[helfer]

@mdebbar What makes you think that it's never true?

[mdebbar]

nvm.. I got confused with the nesting, I thought it was:

if (included) {
  ...
} else if (isInlineFragment(selection)) {
  if (included) {
    ...
  }
}