Fix file watcher notifier being dropped.

src/save_cptv.rs

@@ -31,15 +31,20 @@ pub fn save_cptv_file_to_disk(cptv_bytes: Vec<u8>, output_dir: &str) {
                     );
                     let decoder = MultiGzDecoder::new(&cptv_bytes[..]);
                     let mut encoder = GzEncoder::new(decoder, Compression::default());
-                    let mut cptv_bytes = Vec::new();
-                    encoder.read_to_end(&mut cptv_bytes).unwrap();
+                    let mut new_cptv_bytes = Vec::new();
+                    encoder.read_to_end(&mut new_cptv_bytes).unwrap();
+
+                    // Only use the re-compressed file if it actually got smaller.
+                    if new_cptv_bytes.len() > cptv_bytes.len() {
+                        new_cptv_bytes = cptv_bytes;
+                    }
                     // If the file already exists, don't re-save it.
                     let is_existing_file = match fs::metadata(&path) {
-                        Ok(metadata) => metadata.len() as usize == cptv_bytes.len(),
+                        Ok(metadata) => metadata.len() as usize == new_cptv_bytes.len(),
                         Err(_) => false,
                     };
                     if !is_existing_file {
-                        match fs::write(&path, &cptv_bytes) {
+                        match fs::write(&path, &new_cptv_bytes) {
                             Ok(()) => {
                                 info!("Saved CPTV file {}", path);
                             }