fix: support multi-line attributes for style and script tags

[fkatsuhiro]

Changes

#14657
Fix syntax highlighting for <style> and <script> tags when followed by a newline.

• Updated the begin regex in tags-lang to use a multi-line lookahead (?=[\s\S]*?>), ensuring the grammar continues scanning for attributes across line breaks.
• Replaced line-restricted matchers [^>]? with multi-line matchers [\s\S]? in language identification patterns.
• Adjusted tags-lang-start-attributes to allow whitespace/newlines between the tag name and its attributes using \G|\s+.

Testing

Docs

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[Princesseuh]

Hello, apologies for the delay! You can test this by creating a new .astro file in packages/language-tools/vscode/test/grammar/fixtures and running the update-grammar-snapshots script from the vscode folder. It'll generate a .snap showing all the scopes applied on the code based on the rules (you can check the other .snap for example, there's already one for sass showing the expected scope inside the style tag)

Make sure to build your grammar before updating the snapshots using the build:grammar or dev:grammar scripts from the vscode package.

As for the current solution you have, it does not strike me as problematic, assuming it works!

[fkatsuhiro]

Thank you for the detailed instructions on how to test the grammar changes! I'm also relieved to hear that my current approach seems okay to you.

I will try creating the fixture and running the scripts as you suggested a bit later. I'll get back to you with the results once I've had a chance to verify the snapshots. Thanks again!