fixed fallback text selection on Safari

Sortable.js

@@ -1095,6 +1095,9 @@
 
 			_this._dragStartId = _nextTick(_this._dragStarted.bind(_this, fallback));
 			_on(document, 'selectstart', _this);
+			if (Safari) {
+				_css(document.body, 'user-select', 'none');
+			}
 		},
 
 		// Returns true - if no further action is needed (either inserted or another condition)
@@ -1415,6 +1418,10 @@
 				_off(document, 'dragover', _checkAlignment);
 			}
 
+			if (Safari) {
+				_css(document.body, 'user-select', '');
+			}
+
 			this._offUpEvents();
 
 			if (evt) {