[flutter_markdown] Pass parent TextStyle down to MarkdownElementBuilder.visitElementAfter (#4393)

The parent `TextStyle` should be passed down to the `MarkdownElementBuilder.visitElementAfter` method to allow custom markdown tags to override only part of the text style, e.g. the color, but keep all the rest of the styles the same.

This is especially useful when trying to color markdown headers in a certain color, as the parent font size, font family, etc. all are passed down and can be kept, while only the color is overridden.

This will unfortunately lead to a breaking change, due to the nature of how the class is typically used. As all usages of the class are sub-classes any change to the method schema will result in a breaking change!

Enables the following https://github.com/flutter/flutter/issues/105571

replaces https://github.com/flutter/packages/pull/3281
5 files changed
tree: b365b0cce98e43b483ffb4fb98ba590b7c45eeb1
  1. .ci/
  2. .github/
  3. packages/
  4. script/
  5. third_party/
  6. -
  7. .ci.yaml
  8. .cirrus.yml
  9. .clang-format
  10. .gitattributes
  11. .gitignore
  12. .gitmodules
  13. .metadata
  14. analysis_options.yaml
  15. AUTHORS
  16. CODEOWNERS
  17. CONTRIBUTING.md
  18. customer_testing.bat
  19. customer_testing.sh
  20. LICENSE
  21. README.md
README.md

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