edit

front/static/document.js

@@ -176,8 +176,11 @@ var Document =
         var w = c.width();
         var b = w/self.width;
         if (self.left) {
-            var z = 100-(100/b) + self.zoom;
-            $(self.option.reader).css('zoom', z + '%');
+            if (w - self.width > 10) {
+                var z = 100-(100/b) + self.zoom;
+                $(self.option.reader).css('zoom', z + '%');
+            }
+            
             c = c.children().eq(0);
             e = c.children().eq(0);
             if (!e.length) {