[elements] Fix repeating expand/collapse triangles.

This CL addresses the issue that the triangles for expanding and
collapsing elements tree items would start repeating if the user
increases the font size. It also fixes the vertical misaligment
of the collapsed (right triangle) icon by only subtracting top
margin in the case of expanded icon (where we actually need to
offset by 2 instead of 1 pixel).

Fixed: chromium:1307186
Screenshot: https://imgur.com/BKhAiz7.png
Change-Id: I991d4fd38ee20a5fe4f211f53fe48f763948008d
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5134891
Auto-Submit: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
1 file changed
tree: fa5972a5f4d98f79072cc132db6aaf8a58b66f95
  1. .vscode/
  2. build_overrides/
  3. config/
  4. docs/
  5. extension-api/
  6. extensions/
  7. front_end/
  8. inspector_overlay/
  9. node_modules/
  10. scripts/
  11. test/
  12. third_party/
  13. v8/
  14. .clang-format
  15. .editorconfig
  16. .eslintignore
  17. .eslintrc.js
  18. .git-blame-ignore-revs
  19. .gitattributes
  20. .gitignore
  21. .gitmodules
  22. .gn
  23. .mailmap
  24. .npmignore
  25. .npmrc
  26. .style.yapf
  27. .stylelintignore
  28. .stylelintrc.json
  29. AUTHORS
  30. BUILD.gn
  31. codereview.settings
  32. DEPS
  33. LICENSE
  34. OWNERS
  35. package-lock.json
  36. package.json
  37. PRESUBMIT.py
  38. README.md
  39. tsconfig.json
  40. WATCHLISTS
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