Fixed text selection.

Made Breadcrumb a PureComponent.

src/front-end.jsx

@@ -62,7 +62,7 @@ class FrontEnd extends PureComponent {
 
         if (typeof(window) === 'object') {
             let Hammer = require('hammerjs');
-            let hammer = new Hammer(document.body);
+            let hammer = new Hammer(document.body, { cssProps: { userSelect: 'auto' } });
             hammer.on('swipeleft', this.handleSwipeLeft);
             hammer.on('swiperight', this.handleSwipeRight);
         }

src/widgets/breadcrumb.jsx

@@ -1,15 +1,19 @@
-import React from 'react';
+import React, { PureComponent } from 'react';
 
-function Breadcrumb(props) {
-    let { trail } = props;
-    let children = []
-    let key = 0;
-    for (let item of trail) {
-        children.push(<a key={key++} href={item.url}>{item.label}</a>);
-        children.push(' > ');
+class Breadcrumb extends PureComponent {
+    static displayName = 'Breadcrumb';
+
+    render() {
+        let { trail } = this.props;
+        let children = []
+        let key = 0;
+        for (let item of trail) {
+            children.push(<a key={key++} href={item.url}>{item.label}</a>);
+            children.push(' > ');
+        }
+        children.pop();
+        return <h4 className="breadcrumb">{children}</h4>;
     }
-    children.pop();
-    return <h4 className="breadcrumb">{children}</h4>;
 }
 
 if (process.env.NODE_ENV !== 'production') {