sort: don't double sort when dirfirst is set

nav.go

@@ -278,12 +278,12 @@ func (dir *dir) sort() {
 			return oldlessfun(j, i)
 		}
 	}
-	sort.SliceStable(dir.files, lessfun)
 
 	// when dironly option is enabled, we move files to the beginning of our file
 	// list and then set the beginning of displayed files to the first directory
 	// in the list
 	if dir.dironly {
+		sort.SliceStable(dir.files, lessfun)
 		sort.SliceStable(dir.files, func(i, j int) bool {
 			if !dir.files[i].IsDir() && !dir.files[j].IsDir() {
 				return i < j
@@ -301,7 +301,7 @@ func (dir *dir) sort() {
 	} else if dir.dirfirst {
 		sort.SliceStable(dir.files, func(i, j int) bool {
 			if dir.files[i].IsDir() == dir.files[j].IsDir() {
-				return i < j
+				return lessfun(i, j)
 			}
 			return dir.files[i].IsDir()
 		})