Fix obsolete change views taking over again

We create one change view per change number. When the user navigates
from one change to another (for example in the "relation chain" panel),
then a new change view is created and the old change view becomes
obsolete.

The change view detects becoming obsolete when the router params change.
But it would still reload its data and while doing so potentially
trigger a navigation event, which could send the user back to the
obsolete change. This change adds a check to loadData() and thus
prevents the undesired navigation.

The change view was also checked that it does not emit navigation events
in other locations. So the same or a similar bug might be lurking
somewhere, but at least not in an obvious fashion. :-)

In the future when we are changing more towards working with reactive
observables, we will then be able to add `takeUntil(obsolete$)` to all
state updates and event streams. That will eventually take care of the
issue in a more appropriate and safer way.

Change-Id: I0a6f8fd5250c12f4a572ecadbd62293bb97391c9
2 files changed
tree: af680e3e893441d17328193390e143fe81ca4756
  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
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