fix(Manager): Hammer.defaults.cssProps are restored on destory

src/manager.js

@@ -15,6 +15,7 @@ function Manager(element, options) {
     this.handlers = {};
     this.session = {};
     this.recognizers = [];
+    this.oldCssProps = {};
 
     this.element = element;
     this.input = createInputInstance(this);
@@ -272,9 +273,19 @@ function toggleCssProps(manager, add) {
     if (!element.style) {
         return;
     }
+    var prop;
     each(manager.options.cssProps, function(value, name) {
-        element.style[prefixed(element.style, name)] = add ? value : '';
+        prop = prefixed(element.style, name);
+        if (add) {
+            manager.oldCssProps[prop] = element.style[prop];
+            element.style[prop] = value;
+        } else {
+            element.style[prop] = manager.oldCssProps[prop] || '';
+        }
     });
+    if (!add) {
+        manager.oldCssProps = {};
+    }
 }
 
 /**

tests/unit/test_hammer.js

@@ -157,3 +157,31 @@ test('Remove non-existent recognizer.', function() {
 
     equal(1, hammer.recognizers.length);
 });
+
+test('check whether Hammer.defaults.cssProps is restored', function() {
+    var beforeCssProps = {
+        userSelect: 'text',
+        touchSelect: 'grippers',
+        touchCallout: 'default',
+        contentZooming: 'chained',
+        userDrag: 'element',
+        tapHighlightColor: 'rgba(0, 1, 0, 0)'
+    };
+    var prop;
+    Hammer.each(Hammer.defaults.cssProps, function(value, name) {
+        prop = Hammer.prefixed(el.style, name);
+        if (prop) {
+            el.style[prop] = beforeCssProps[name];
+        }
+    });
+
+    hammer = Hammer(el);
+    hammer.destroy();
+    hammer = null;
+    Hammer.each(Hammer.defaults.cssProps, function(value, name) {
+        prop = Hammer.prefixed(el.style, name);
+        if (prop) {
+            equal(el.style[prop], beforeCssProps[name], "check if " + name + " is restored");
+        }
+    });
+});