Use PollWatcher to always get filesystem updates

See #2102 (comment)
for explanation on this

Closes #2102, #2035, #383 and #1441

src/cmd/watch.rs

@@ -107,9 +107,15 @@ where
 
     // Create a channel to receive the events.
     let (tx, rx) = channel();
-
-    let mut debouncer = match notify_debouncer_mini::new_debouncer(Duration::from_secs(1), None, tx)
-    {
+    // Notify backend configuration
+    let backend_config = notify::Config::default().with_poll_interval(Duration::from_secs(1));
+
+    let mut debouncer = match notify_debouncer_mini::new_debouncer_opt::<_, notify::PollWatcher>(
+        Duration::from_secs(1),
+        None,
+        tx,
+        backend_config,
+    ) {
         Ok(d) => d,
         Err(e) => {
             error!("Error while trying to watch the files:\n\n\t{:?}", e);