Fix arrow key scrolling by allowing shortcuts to not prevent default

In dom-util we already have a `doNotPrevent` shortcut option. Add this
option to shortcut-controller, as well. And add the corresponding
`options` parameter optionally to a couple of signatures.

Then fix the actual bug, which is that arrow keys should allow the user
to scroll on the change page. The shortcuts bound by file-list were
preventing that, because they trigger on arrow key strokes, and the
default behavior of a keyboard shortcut is that `preventDefault()` is
called. We are now setting the new option and deciding in the handler
method whether preventing default is desired or not.

This was tested using Dev Helper: Browser scrolling using arrow keys
works on the change page when the file list is not "all expanded".

Release-Notes: skip
Google-Bug-Id: b/211878043
Change-Id: I61034ec7cdd13a303be3e4b30370be09ff6ab830
3 files changed
tree: f651172c61fd6c8ff06e55ad30893d61cb6bb6a3
  1. .settings/
  2. .ts-out/
  3. antlr3/
  4. contrib/
  5. Documentation/
  6. e2e-tests/
  7. java/
  8. javatests/
  9. lib/
  10. modules/
  11. plugins/
  12. polygerrit-ui/
  13. prolog/
  14. prologtests/
  15. proto/
  16. resources/
  17. tools/
  18. webapp/
  19. .bazelignore
  20. .bazelproject
  21. .bazelrc
  22. .bazelversion
  23. .editorconfig
  24. .git-blame-ignore-revs
  25. .gitignore
  26. .gitmodules
  27. .gitreview
  28. .mailmap
  29. .pydevproject
  30. .zuul.yaml
  31. BUILD
  32. COPYING
  33. INSTALL
  34. Jenkinsfile
  35. package.json
  36. README.md
  37. SUBMITTING_PATCHES
  38. version.bzl
  39. WORKSPACE
  40. yarn.lock
README.md

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