fix: stop windows installer from rewriting config

refs #1162

2 files changed, 20 insertions, 1 deletions

diff --git a/src/config/model.rs b/src/config/model.rs
index 8f94b4da..ee97c2c8 100644
--- a/src/config/model.rs
+++ b/src/config/model.rs
@@ -1116,6 +1116,24 @@ manifest_check = false
         assert!(!config.update.manifest_check);
     }
 
+    #[cfg(windows)]
+    #[test]
+    fn windows_update_config_defaults_to_preview() {
+        let empty: Config = toml::from_str("").unwrap();
+        let without_update_channel: Config =
+            toml::from_str("[update]\nversion_check = false").unwrap();
+
+        assert_eq!(
+            Config::default().update.channel,
+            UpdateChannelConfig::Preview
+        );
+        assert_eq!(empty.update.channel, UpdateChannelConfig::Preview);
+        assert_eq!(
+            without_update_channel.update.channel,
+            UpdateChannelConfig::Preview
+        );
+    }
+
     #[test]
     fn terminal_default_shell_defaults_empty_and_parses() {
         let default_config = Config::default();
diff --git a/src/main.rs b/src/main.rs
index 575e23f8..a439ad34 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -145,7 +145,8 @@ const DEFAULT_CONFIG: &str = r##"# herdr configuration
 
 [update]
 # Update channel used by background version checks and `herdr update`.
-# Use "stable" for normal releases or "preview" for opt-in preview builds.
+# Defaults to "stable" on Linux/macOS and "preview" on Windows.
+# Set explicitly to choose stable releases or opt-in preview builds.
 # channel = "stable"
 
 # Check herdr.dev for new Herdr versions in the background.