Fix #257: Fix upload single to replace thumbs correctly

CHANGE.md

@@ -16,6 +16,7 @@ version 4.1.9
 12. (enh #251): Add Italian localizations.
 13. (enh #252): Enhance async batch completion.
 14. (bug #253): Fix initial preview delete cache initialization.
+15. (bug #257): Fix upload single to replace thumbs correctly.
 
 version 4.1.8
 =============

js/fileinput.js

@@ -1187,7 +1187,7 @@
                 tags = out.initialPreviewThumbTags || [];
                 append = out.append === undefined || out.append ? true : false;
                 self.overwriteInitial = false;
-                if ($thumb !== undefined && !!allFiles) {
+                if ($thumb !== undefined && !allFiles) {
                     index = previewCache.add(self.id, content, config[0], tags[0], append);
                     data = previewCache.get(self.id, index, false);
                     $newThumb = $(data).hide();