Remove language_overrides setting alias (#13164)

This PR removes the `language_overrides` alias for the `languages`
setting.

I've seen a number of people run into issues where they have both
`languages` and `language_overrides` in their settings and get confused
when their settings don't seem to apply as expected.

This is a breaking change, but I think it is a necessary one to prevent
more users from running into issues.

Release Notes:

- Breaking Change: Removed the `language_overrides` alias for the
`languages` setting. If you have settings under `language_overrides`
they should get moved to `languages`.

crates/language/src/language_settings.rs

@@ -200,7 +200,7 @@ pub struct AllLanguageSettingsContent {
     #[serde(flatten)]
     pub defaults: LanguageSettingsContent,
     /// The settings for individual languages.
-    #[serde(default, alias = "language_overrides")]
+    #[serde(default)]
     pub languages: HashMap<Arc<str>, LanguageSettingsContent>,
     /// Settings for associating file extensions and filenames
     /// with languages.
@@ -754,17 +754,10 @@ impl settings::Settings for AllLanguageSettings {
             .as_mut()
             .unwrap()
             .properties
-            .extend([
-                (
-                    "languages".to_owned(),
-                    Schema::new_ref("#/definitions/Languages".into()),
-                ),
-                // For backward compatibility
-                (
-                    "language_overrides".to_owned(),
-                    Schema::new_ref("#/definitions/Languages".into()),
-                ),
-            ]);
+            .extend([(
+                "languages".to_owned(),
+                Schema::new_ref("#/definitions/Languages".into()),
+            )]);
 
         root_schema
     }

crates/settings/src/settings_store.rs

@@ -866,9 +866,6 @@ fn replace_value_in_json_text(
     tab_size: usize,
     new_value: &serde_json::Value,
 ) -> (Range<usize>, String) {
-    const LANGUAGE_OVERRIDES: &str = "language_overrides";
-    const LANGUAGES: &str = "languages";
-
     lazy_static! {
         static ref PAIR_QUERY: tree_sitter::Query = tree_sitter::Query::new(
             &tree_sitter_json::language(),
@@ -883,8 +880,6 @@ fn replace_value_in_json_text(
 
     let mut cursor = tree_sitter::QueryCursor::new();
 
-    let has_language_overrides = text.contains(LANGUAGE_OVERRIDES);
-
     let mut depth = 0;
     let mut last_value_range = 0..0;
     let mut first_key_start = None;
@@ -914,13 +909,7 @@ fn replace_value_in_json_text(
 
         let found_key = text
             .get(key_range.clone())
-            .map(|key_text| {
-                if key_path[depth] == LANGUAGES && has_language_overrides {
-                    key_text == format!("\"{}\"", LANGUAGE_OVERRIDES)
-                } else {
-                    key_text == format!("\"{}\"", key_path[depth])
-                }
-            })
+            .map(|key_text| key_text == format!("\"{}\"", key_path[depth]))
             .unwrap_or(false);
 
         if found_key {
@@ -943,20 +932,12 @@ fn replace_value_in_json_text(
         (existing_value_range, new_val)
     } else {
         // We have key paths, construct the sub objects
-        let new_key = if has_language_overrides && key_path[depth] == LANGUAGES {
-            LANGUAGE_OVERRIDES
-        } else {
-            key_path[depth]
-        };
+        let new_key = key_path[depth];
 
         // We don't have the key, construct the nested objects
         let mut new_value = serde_json::to_value(new_value).unwrap();
         for key in key_path[(depth + 1)..].iter().rev() {
-            if has_language_overrides && key == &LANGUAGES {
-                new_value = serde_json::json!({ LANGUAGE_OVERRIDES.to_string(): new_value });
-            } else {
-                new_value = serde_json::json!({ key.to_string(): new_value });
-            }
+            new_value = serde_json::json!({ key.to_string(): new_value });
         }
 
         if let Some(first_key_start) = first_key_start {