fix fsnotify watcher not fully working

[wjiec]

When modifying the views.yml file with vim, the event reported by fsnotify is RENAME, which results in the loss of the watcher on the original file. References fsnotify.Watcher.Add comment:

// # Watching files
//
// Watching individual files (rather than directories) is generally not
// recommended as many tools update files atomically. Instead of "just" writing
// to the file a temporary file will be written to first, and if successful the
// temporary file is moved to to destination removing the original, or some
// variant thereof. The watcher on the original file is now lost, as it no
// longer exists.

[wjiec]

I was puzzled when testing #2253 because I changed the config file but the code didn't take effect. So I tried to find the reason. 🤔️

[derailed]

@wjiec Nice catch Jayson! Thank you for this update!!