Add new action and handler for opening a specific setting (#40739)

Co-authored-by: Ben Kunkle <ben@zed.dev>

crates/zed_actions/src/lib.rs

@@ -30,12 +30,12 @@ pub struct OpenZedUrl {
 actions!(
     zed,
     [
+        /// Opens the settings editor.
         #[action(deprecated_aliases = ["zed_actions::OpenSettingsEditor"])]
         OpenSettings,
         /// Opens the settings JSON file.
         #[action(deprecated_aliases = ["zed_actions::OpenSettings"])]
         OpenSettingsFile,
-        /// Opens the settings editor.
         /// Opens the default keymap file.
         OpenDefaultKeymap,
         /// Opens the user keymap file.
@@ -107,6 +107,16 @@ pub struct IncreaseBufferFontSize {
     pub persist: bool,
 }
 
+/// Increases the font size in the editor buffer.
+#[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
+#[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
+pub struct OpenSettingsAt {
+    /// A path to a specific setting (e.g. `theme.mode`)
+    #[serde(default)]
+    pub path: String,
+}
+
 /// Resets the buffer font size to the default value.
 #[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
 #[action(namespace = zed)]