[Editing] Prevent adding newline character after space key press

The issue involved the textarea where pressing the space key before any
character in multi-line wrapped content caused unwanted newline
characters. This bug was introduced by the change list [1]. A line break
was automatically added so that spaces appeared at the caret. This logic
has now been removed. Typing spaces at the start of a wrapped line was
confusing because the spaces ended up in the previous line. To address
this, the caret's affinity has been changed from downstream to upstream
whenever possible. This adjustment ensures the caret is positioned
correctly and spaces inserted are properly visible.

There is an issue [2] filed on w3c for the expected specification
change.

[1] - https://codereview.chromium.org/2618613004

[2] - https://github.com/w3c/editing/issues/482

Bug: 40677155
Change-Id: Ida00847e32ef9c2efdd7ddde38d798528947593f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6254377
Reviewed-by: Sambamurthy Bandaru <sambamurthy.bandaru@microsoft.com>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Commit-Queue: Pranav Modi <pranavmodi@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1447804}
5 files changed
tree: 8c93889752729a4b049a4bcd1036b320286e2be3
  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. crypto/
  16. dbus/
  17. device/
  18. docs/
  19. extensions/
  20. fuchsia_web/
  21. gin/
  22. google_apis/
  23. gpu/
  24. headless/
  25. infra/
  26. ios/
  27. ipc/
  28. media/
  29. mojo/
  30. native_client_sdk/
  31. net/
  32. pdf/
  33. ppapi/
  34. printing/
  35. remoting/
  36. rlz/
  37. sandbox/
  38. services/
  39. skia/
  40. sql/
  41. storage/
  42. styleguide/
  43. testing/
  44. third_party/
  45. tools/
  46. ui/
  47. url/
  48. webkit/
  49. .clang-format
  50. .clang-tidy
  51. .clangd
  52. .git-blame-ignore-revs
  53. .gitallowed
  54. .gitattributes
  55. .gitignore
  56. .gitmodules
  57. .gn
  58. .mailmap
  59. .rustfmt.toml
  60. .vpython3
  61. .yapfignore
  62. ATL_OWNERS
  63. AUTHORS
  64. BUILD.gn
  65. CODE_OF_CONDUCT.md
  66. codereview.settings
  67. CPPLINT.cfg
  68. CRYPTO_OWNERS
  69. DEPS
  70. DIR_METADATA
  71. LICENSE
  72. LICENSE.chromium_os
  73. OWNERS
  74. PRESUBMIT.py
  75. PRESUBMIT_test.py
  76. PRESUBMIT_test_mocks.py
  77. README.md
  78. WATCHLISTS
README.md

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