Fix thin strokes on macOS

Remove the `font.use_thin_strokes` config, which only did anything on
macOS and only prior to Big Sur. Instead, we will enable or disable
"font smoothing" on macOS based on the `AppleFontSmoothing` user
default.

These changes let users get the "thin strokes" behavior by setting
`AppleFontSmoothing` to 0 with:

```sh
$ defaults write -g AppleFontSmoothing -int 0
```

(Or replace `-g` with `org.alacritty` to apply this setting only to
Alacritty.app, rather than the whole system.)

Add a `removed` config attribute to show helpful warnings to users
who are using config options that don't do anything anymore, and apply
this attribute to `font.use_thin_strokes`.

Bump `crossfont` to 0.5.0 to pick up the new font smoothing behavior.
This release also includes a fix for a crash when trying to load a
disabled font.

Fixes #4616.
Fixes #6108.

1 files changed, 4 insertions, 4 deletions

diff --git a/alacritty_config_derive/src/de_struct.rs b/alacritty_config_derive/src/de_struct.rs
index ceb32fd9..cf7ea141 100644
--- a/alacritty_config_derive/src/de_struct.rs
+++ b/alacritty_config_derive/src/de_struct.rs
@@ -135,14 +135,14 @@ fn field_deserializer(field_streams: &mut FieldStreams, field: &Field) -> Result
                     config.#ident = serde::Deserialize::deserialize(unused).unwrap_or_default();
                 });
             },
-            "deprecated" => {
-                // Construct deprecation message and append optional attribute override.
-                let mut message = format!("Config warning: {} is deprecated", literal);
+            "deprecated" | "removed" => {
+                // Construct deprecation/removal message with optional attribute override.
+                let mut message = format!("Config warning: {} has been {}", literal, parsed.ident);
                 if let Some(warning) = parsed.param {
                     message = format!("{}; {}", message, warning.value());
                 }
 
-                // Append stream to log deprecation warning.
+                // Append stream to log deprecation/removal warning.
                 match_assignment_stream.extend(quote! {
                     log::warn!(target: #LOG_TARGET, #message);
                 });