[css-grid] Prevent FindUsedFlexFraction from iterating items twice

IndefiniteSizeStrategy::FindUsedFlexFraction needs to iterate all grid
items that cross a flexible track. To do so it, takes the indices of the
flex tracks, and for each one it uses GridIterator to iterate the items
in that track.

Then, to avoid processing the same item multiple times, it used to check
that the item started in the current flex track, not in a previous one.

However, this was insufficient: it wasn't taking into account that an
item can be in a single flex track, but span multiple tracks in the
other axis.

Therefore, this patch changes it to use the same approach as in
GridTrackSizingAlgorithm::ResolveIntrinsicTrackSizes, i.e. creates a
HashSet outside of the loop, and inserts each given grid item to it,
checking whether it's a new entry or not.

Bug: 1026275
Change-Id: Ia0327e0459f2398de84b27851be53867f9be5f7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506210
Reviewed-by: Manuel Rego <rego@igalia.com>
Reviewed-by: Javier Fernandez <jfernandez@igalia.com>
Commit-Queue: Oriol Brufau <obrufau@igalia.com>
Cr-Commit-Position: refs/heads/master@{#821910}
1 file changed
tree: a47c4dd38651435f25b8e6a387ac5dd33975922f
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. cloud_print/
  13. codelabs/
  14. components/
  15. content/
  16. courgette/
  17. crypto/
  18. dbus/
  19. device/
  20. docs/
  21. extensions/
  22. fuchsia/
  23. gin/
  24. google_apis/
  25. google_update/
  26. gpu/
  27. headless/
  28. infra/
  29. ios/
  30. ipc/
  31. jingle/
  32. media/
  33. mojo/
  34. native_client_sdk/
  35. net/
  36. pdf/
  37. ppapi/
  38. printing/
  39. remoting/
  40. rlz/
  41. sandbox/
  42. services/
  43. skia/
  44. sql/
  45. storage/
  46. styleguide/
  47. testing/
  48. third_party/
  49. tools/
  50. ui/
  51. url/
  52. weblayer/
  53. .clang-format
  54. .clang-tidy
  55. .eslintrc.js
  56. .git-blame-ignore-revs
  57. .gitattributes
  58. .gitignore
  59. .gn
  60. .vpython
  61. .vpython3
  62. .yapfignore
  64. BUILD.gn
  66. codereview.settings
  67. DEPS
  71. LICENSE.chromium_os
  72. OWNERS
  73. PRESUBMIT.py
  74. PRESUBMIT_test.py
  75. PRESUBMIT_test_mocks.py
  76. README.md

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