Fix directory traversal

src/containers/PinnedManager/PinnedManager.js

@@ -34,7 +34,7 @@ export default connect(mapStateToProps, mapDispatchToProps)(class extends IPCCon
   state = {
     active_directory: '/',
     items: [],
-    previous_directory: '',
+    previous: [],
   }
 
   componentDidMount() {
@@ -89,11 +89,16 @@ export default connect(mapStateToProps, mapDispatchToProps)(class extends IPCCon
       <div key={'dir_' + idx} style={{...style}}>
         <Button buttonStyles={{textAlign: 'left'}}
                 clicked={() => {
-                  const current_path = path === '..' ? '' : this.state.active_directory;
+                  const previous = [...this.state.previous];
+                  if (path === '..') {
+                    path = previous.pop();
+                  } else {
+                    previous.push(this.state.active_directory);
+                  }
                   this.setState({
                     items: [],
-                    active_directory: path === '..' ? this.state.previous_directory : path,
-                    previous_directory: current_path,
+                    active_directory: path,
+                    previous,
                   }, () => {
                     this.grabDirectoryItems();
                   });