[kernel/DDC] Fix failing DDC tests; if finding no scope for offset find for a close previous offset instead

When landing https://dart-review.googlesource.com/c/sdk/+/342400
the ddc-mac builder (but not Linux and Windows) started failing.
I could reproduce on Linux though so I'm not sure why those builders
didn't fail (nor why it wasn't caught by the try bot), either way this
fixes the issues:

* Test update: E.g. a breakpoint at the end of the scope doesn't work
  because it will not be inside the (wanted) scope.
* Test update: Evalating "this" now actually works.
* Scope finding update: DDC adds sourcemapping entries for the *end* of
  things so e.g. the getter "c" will have offset and offset+1 added as
  source mappings. When translating from javascript position to dart
  position we might pick that and thus ask for the scope of offset+1,
  but nothing will be found because no node has that offset.
  Here I add a fall-back saying that if we get no results we ask again
  for the nearest lower offset.

Change-Id: I7e4430d9954466494b514cf51d999358483c9f8c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/345501
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Anna Gringauze <annagrin@google.com>
2 files changed
tree: 700e5e385f535f388e5356aa7b8e35836e9911b2
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .style.yapf
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. DEPS
  27. LICENSE
  28. OWNERS
  29. PATENT_GRANT
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. sdk.code-workspace
  34. sdk_args.gni
  35. SECURITY.md
  36. WATCHLISTS
README.md

Dart

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