Handle nodeless break opportunities in AXPosition::FromPosition

The accessible text exposed to assistive technologies comes from the
InlineTextBox content; characters representing break opportunities are

If the break opportunity has an associated node, such as <wbr>,
AXPosition is able to connect that character's content offsets
with the "ignored" accessibility object, and ensure the text offsets
exposed to ATs correspond to the accessible text. It needs to do the
same for break opportunities which lack an associated node, such as
those inserted at the end of preserved leading spaces.

Create AXPosition::AdjustContentOffsetForNonContiguousMappings which
identifies nodeless break opportunities and adjusts the accessible
content offset accordingly.

AX-Relnotes: Screen readers should no longer present the wrong character
during caret navigation if "white-space: pre-wrap" is applied to an
element with leading spaces.

Bug: 1442835
Change-Id: I914d051b942dcd50de55674816e32cfbf578e5a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4543184
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Joanmarie Diggs <jdiggs@igalia.com>
Reviewed-by: Benjamin Beaudry <benjamin.beaudry@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1150216}
3 files changed
tree: 7c2bbc83ce1d37ab0e768248b2e97e864d9d7a1b
  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. codelabs/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia_web/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. media/
  31. mojo/
  32. native_client_sdk/
  33. net/
  34. pdf/
  35. ppapi/
  36. printing/
  37. remoting/
  38. rlz/
  39. sandbox/
  40. services/
  41. skia/
  42. sql/
  43. storage/
  44. styleguide/
  45. testing/
  46. third_party/
  47. tools/
  48. ui/
  49. url/
  50. weblayer/
  51. .clang-format
  52. .clang-tidy
  53. .eslintrc.js
  54. .git-blame-ignore-revs
  55. .gitattributes
  56. .gitignore
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  64. BUILD.gn
  66. codereview.settings
  67. DEPS
  70. LICENSE.chromium_os
  71. OWNERS
  72. PRESUBMIT.py
  73. PRESUBMIT_test.py
  74. PRESUBMIT_test_mocks.py
  75. README.md

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