Revert "hugolib: Fix live-reload regression for add/removal of dirs"

Never mind. The "adding dir" scenario didn't work anyway, so that will need another fix.

This reverts commit 49a104309d.

Closes ##3325

hugolib/site.go

@@ -753,6 +753,9 @@ func (s *Site) reProcess(events []fsnotify.Event) (whatChanged, error) {
 		go pageConverter(pageChan, convertResults, wg2)
 	}
 
+	sp := source.NewSourceSpec(s.Cfg, s.Fs)
+	fs := sp.NewFilesystem("")
+
 	for _, ev := range sourceChanged {
 		// The incrementalReadCollator below will also make changes to the site's pages,
 		// so we do this first to prevent races.
@@ -775,6 +778,15 @@ func (s *Site) reProcess(events []fsnotify.Event) (whatChanged, error) {
 			}
 		}
 
+		// ignore files shouldn't be proceed
+		if fi, err := s.Fs.Source.Stat(ev.Name); err != nil {
+			continue
+		} else {
+			if ok, err := fs.ShouldRead(ev.Name, fi); err != nil || !ok {
+				continue
+			}
+		}
+
 		sourceReallyChanged = append(sourceReallyChanged, ev)
 	}