Visual Studio Code never reopens previous file or folder

It seems, VsCode only remembers opened files, if you also have a folder opened. It doesn't matter, if this is just a Dummy Folder somewhere on your drive - if you open files outside of this folder, they will be remembered aswell.

I'm not sure if this is as designed, or a bug.

Edit: This is a bug and tracked here

Edit 2: To sum up the answers from below there are now two settings concerning this issue:

Hot exit has been implemented, which restores files which weren't saved before VS Code is closed. To change this, use this setting:

files.hotExit: "onExit"

To reopen all files, use this setting:

window.restoreWindows: "all"

But there is still on open issue with this found here.

...

Go to: Open File --> Preferences --> Settings and add "window.restoreWindows": "all" to your settings.json file. Remember to add a comma to the preceding statement.

This will reopen all the windows you had open on the close of your last session.

You could try the settings option:

"window.reopenFolders": "all"

This should reopen everything that was opened when you closed the editor, but I haven't tested it. I usually prefer that nothing gets reopened, so I use none. The default is one.