fix: look up unquoted font-family names containing spaces

[Sanjays2402]

Closes #374

convertFontFamily split the font-family attribute with split_attr_list, which replaces commas with spaces before shlex.split, so an unquoted family name like Cascadia Code became Cascadia and Code and never matched a font registered under its full name.

Splitting now separates only on commas, yielding the full name first and the individual words afterwards so the previous lookup still works as a fallback. New test in tests/test_fonts.py fails without the change (Cascadia instead of Courier) and passes with it.

[deeplook]

Thanks—this fixes the intended case: unquoted multi-word families such as font-family: Cascadia Code are now looked up as the complete name before falling back to individual words. The focused font tests pass.

One blocking edge case: split_font_family_list() uses attr.split(","), which splits commas inside quoted CSS family names. For example:

font-family: "Foo, Bar", Arial

causes shlex.split() to receive unmatched quote fragments and raises:

ValueError: No closing quotation

This can abort SVG conversion for a valid font-family value.

Could we split on commas only when outside quoted strings (respecting escapes), and add a regression test for "Foo, Bar", Arial?

[Sanjays2402]

Good catch, thanks. Fixed in 1686c3f: split_font_family_list() now walks the string and only breaks on commas that are outside a quoted section, tracking the active quote char and honouring backslash escapes, so "Foo, Bar", Arial yields ["Foo, Bar", "Arial"] instead of feeding shlex unbalanced fragments.

Added test_font_family_quoted_name_containing_comma in tests/test_fonts.py covering your exact value with both double and single quotes, plus a convertFontFamily() assertion so the valid value resolves rather than aborting. I checked it is not vacuous: with the split reverted to attr.split(",") the test fails with ValueError: No closing quotation, and passes with the fix. Full tests/test_fonts.py is green (40 passed, 2 skipped).

[deeplook]

I'd be happy to include this in the next release which is just around the corner once this is cleaned-up.

[Sanjays2402]

Happy to get it in. Current state on 7cfb105: all checks green, and I have just added the missing CHANGELOG entry under Unreleased/Fixed covering both halves (multi-word unquoted name lookup for #374, and commas inside a quoted name no longer feeding shlex an unbalanced quote).

The other loose end I noticed was the assertion in test_font_family_quoted_name_containing_comma: it originally pinned the resolved fallback name, which is environment-dependent and went red on the Ubuntu jobs, so dfacd2c reduced it to asserting a name comes back at all. The exact-list assertions on split_font_family_list() still cover the actual parsing.

If "cleaned-up" means something more specific, say the word and I will do it. The branch has four commits including a pre-commit.ci autofix, so I can squash to two (fix + test) if you would rather not carry that in history.

[deeplook]

Thanks!