This PR adds support for adding a specific set of mappings from Zed
syntax tokens to VS Code scopes for a particular theme family.
We can use this as a fallback when we aren't otherwise able to rely on
the mappings in the theme importer, as sometimes it isn't possible to
make a specific enough matcher that works across all of the themes.
Release Notes:
- N/A
This PR improves the approach we use to match syntax tokens between Zed
and VS Code in the `theme_importer`.
We now use the list of scopes assigned to each Zed syntax token to rank
the possible candidates in the VS Code and then pick the candidate with
the highest rank.
So far this has proved to provide better colors across the board, but
we'll continue to refine the matching over time.
Release Notes:
- N/A
Marshall Bowers
Nate Butler
