[web] Fix canvas z-index leaking across repaints when element is reused. (#17378)

* Fix z-index leak. Add test for canvas reuse
* add regression test
* update golden locks
* fix analysis errors
3 files changed
tree: ee0683b975ef76b67216ccdd5161dea12c2528f4
  1. .github/
  2. assets/
  3. benchmarking/
  4. build/
  5. ci/
  6. common/
  7. docs/
  8. e2etests/
  9. examples/
  10. flow/
  11. flutter_frontend_server/
  12. fml/
  13. lib/
  14. runtime/
  15. shell/
  16. sky/
  17. testing/
  18. third_party/
  19. tools/
  20. vulkan/
  21. web_sdk/
  22. .cirrus.yml
  23. .clang-format
  24. .gitattributes
  25. .gitignore
  26. analysis_options.yaml
  28. BUILD.gn
  30. DEPS
  31. Doxyfile
  33. README.md

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