Italic doesn't work in MacVim

[georgevreilly]

Various flavors of Vim support italic fonts in syntax highlighting. However, this doesn't work with Cascadia Code or Cascadia Mono. It's almost certainly because the italic fonts are in distinct font families.

To reproduce

1. Launch MacVim. I'm running macOS Big Sur 11.4, but I expect this will reproduce on other versions of macOS.
2. Type :setfiletype flexwiki to set the current buffer into FlexWiki mode.
3. Enter a line that looks like This text is _emphasized_ and this is *strong*.
4. Launch the font dialog: :set guifont=*
5. Choose different fonts. Many fonts, including Source Code Pro, JetBrains Mono, and SF Mono
   will show _emphasized_ in an italic font and *strong* in a bold font, with the rest in the regular font. The Cascadia fonts handle *strong* correctly, but not _emphasized_.

[DHowett]

It would have been very helpful had you filled out the bug template ☹️

Which variants of Cascadia did you install? Variable TTF? OTF? Static TTF? Static OTF? WOFF2?

[aaronbell]

This should be resolved the next time a font release is issued via the fix for #481

[georgevreilly]

@DHowett, I poked around in the issues to see if a similar issue had been reported, didn't find any, and clicked New Issue. No template appeared, so I wrote it up freeform.

I installed all the fonts in the otf/static directory of CascadiaCode-2105.24.zip

[aaronbell]

Thanks for the additional context. This is definitely a dupe of #481 and will be solved with the next release. I suggest trying the variable font version in the meantime.