Fix observing comment threads in gr-diff

Observing the DOM nodes of <gr-diff> should not be tied to the element
being connected or not. If the rendered diff is supposed to be kept
around, then the observers also have to be kept around. Node observing
is used for detecting commen thread elements being added to <gr-diff>.
The main goal is to add <slot> elements on-the-fly, so that comment
threads end up in the correct location in the diff.

Start observing when diff rendering has completed.

Stop observing when the diff is cleared or freshly rendered.

Otherwise don't do anything to the node observers.

It is unclear why we have two node observers instead of one. Added a
TODO.

Generally we think that diff components do too much in
`(dis)connectedCallback()`. They should maybe not worry so much about
their connected state.

Also we believe that re-using of <gr-diff-host> and <gr-diff> across
files is probably not a great idea. This is likely much more trouble
than it is worth. We may run into inconsistent state (threads for old
file, diff content for new file). And cancelling+initializing is much
more error prone than just throwing away and re-creating a component.

Release-Notes: skip
Change-Id: Id863110451f7c5af505f724fc92d2167917e3c77
2 files changed
tree: 23032f88f1852e950a42d4337506d1725c933f90
  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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