AI: fix walkthrough incorrectly showing as loading

Relying only on the isLoading flag was wrong, because if you have more
than one walkthrough, this means they would all be loading. We also have
to check the walkthrough is for the last message and only mark it
loading if that is true as well.

The inline walkthrough already had this, so that is why this fix is only
for the sidebar.

R=kimanh@chromium.org

Fixed: 487940366
Change-Id: I5379c3f06d029e3f7a0fcb3d791de79ade992a49
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7632176
Reviewed-by: Kim-Anh Tran <kimanh@chromium.org>
Auto-Submit: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Jack Franklin <jacktfranklin@chromium.org>
1 file changed
tree: ee32f38710f408c083393bbe3f9ce889987a5c27
  1. .gemini/
  2. .github/
  3. .vscode/
  4. agents/
  5. build_overrides/
  6. config/
  7. docs/
  8. extension-api/
  9. extensions/
  10. front_end/
  11. inspector_overlay/
  12. mcp/
  13. node_modules/
  14. scripts/
  15. test/
  16. third_party/
  17. v8/
  18. .clang-format
  19. .clang-format-ignore
  20. .editorconfig
  21. .env.template
  22. .geminiignore
  23. .git-blame-ignore-revs
  24. .gitallowed
  25. .gitattributes
  26. .gitignore
  27. .gitmodules
  28. .gn
  29. .mailmap
  30. .npmignore
  31. .npmrc
  32. .style.yapf
  33. .stylelintignore
  34. .stylelintrc.json
  35. AUTHORS
  36. BUILD.gn
  37. codereview.settings
  38. CONTRIBUTING.md
  39. DEPS
  40. DIR_METADATA
  41. eslint.config.mjs
  42. favicon.ico
  43. LICENSE
  44. OWNERS
  45. package-lock.json
  46. package.json
  47. PRESUBMIT.py
  48. README.md
  49. WATCHLISTS
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