Added support for safari.

Author: marchaos

package.json

@@ -1,7 +1,7 @@
 {
   "name": "react-virtualized-sticky-tree",
   "description": "A React component for efficiently rendering tree like structures with support for position: sticky",
-  "version": "2.0.15",
+  "version": "2.0.16",
   "author": "Marc McIntyre <[email protected]>",
   "license": "MIT",
   "main": "dist/commonjs/index.js",

src/StickyTree.jsx

@@ -1,5 +1,6 @@
 import React from 'react';
 import PropTypes from 'prop-types';
+import vendorSticky from './vendorSticky';
 
 export default class StickyTree extends React.PureComponent {
 
@@ -450,7 +451,7 @@ export default class StickyTree extends React.PureComponent {
     getClientNodeStyle(node) {
         const style = { height: node.height };
         if (node.isSticky) {
-            style.position = 'sticky';
+            style.position = vendorSticky();
             style.top = node.stickyTop;
             style.zIndex = node.zIndex;
         }

src/vendorSticky.js

@@ -0,0 +1,7 @@
+export default () => {
+    if (/Safari/.test(navigator.userAgent) && /Apple Computer/.test(navigator.vendor)) {
+        return '-webkit-sticky';
+    }
+
+   return 'sticky';
+}