Fix the issue of showing some files outside the workspace.

README.md

@@ -9,6 +9,8 @@
   { "key": "ctrl+e",                 "command": "workbench.action.openRecent" }
   ```
 
+## Notice
+  * We don't list the files outside the workspace.
 ## How to use
   * press `cmd` + `e` (`ctrl` + `e` in Windows)
   * press `F1` then type `Open Recent Files`

extension.js

@@ -59,7 +59,9 @@ function handleUserInput(item) {
 }
 
 function mapUriToDisplayName() {
-  return _.chain(list.slice()).uniq().reverse().map((item) => {
+  return _.chain(list.slice()).uniq().reverse().remove(item => {
+    return item.split(vscode.workspace.rootPath).length != 1
+  }).map((item) => {
     return item.substring(vscode.workspace.rootPath.length + 1)
   }).filter((item) => {
     //ignore the system files which starts with .