A better tollerance for swipe gesture in fotorama gallery.

Author: Danilo Argentiero

lib/web/fotorama/fotorama.js

@@ -1447,18 +1447,22 @@ fotoramaVersion = '4.6.4';
                 }
             } else {
                 stopEvent(e);
-                if (xDiff > yDiff) {
+                if (movedEnough(xDiff,yDiff)) {
                     (options.onMove || noop).call(el, e, {touch: touchFLAG});
                 }
             }
 
-            if (!moved && xDiff > yDiff && Math.sqrt(Math.pow(xDiff, 2) + Math.pow(yDiff, 2)) > tolerance) {
+            if (!moved && movedEnough(xDiff, yDiff) && Math.sqrt(Math.pow(xDiff, 2) + Math.pow(yDiff, 2)) > tolerance) {
                 moved = true;
             }
 
             tail.checked = tail.checked || xWin || yWin;
         }
 
+        function movedEnough(xDiff, yDiff) {
+            return xDiff > yDiff && xDiff > 1.5;
+        }
+
         function onEnd(e) {
             (options.onTouchEnd || noop)();