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
This PR fixes an issues where the hex colors in the generated themes
were not correct.
We're using the [`palette`](https://crates.io/crates/palette) crate to
perform the conversions, as this gives us accurate hex codes that match
the VS Code source themes.
Release Notes:
- N/A
This PR reworks the way we define our third-party themes to make them
work as overlays on top of a base theme.
We introduce the concept of a `UserThemeFamily` that contains
`UserTheme`s. Rather than being an entire theme definition on their own,
a `UserTheme` just contains optional overrides for the values in a
`Theme`.
When resolving a `UserTheme`, we apply it on top of the base theme. Any
values not overridden in the `UserTheme` will fall back to the `Theme`
defaults.
Right now we are just using `UserTheme` to model third-party themes that
we distribute with the Zed binary. However, this same structure can also
be used to import arbitrary user themes (such as from a theme registry,
or even a theme blob from the settings file).
Release Notes:
- N/A
This PR renames the `ThemeVariant` type to `Theme`.
This better reflects its purpose, as well as matches the same name as we
had before, which should make porting crates slightly easier.
Release Notes:
- N/A
