Xcode History (back/forward) Keyboard Shortcut?

In XCode 4.4 the following sequence works:

Cmd + Ctrl + ←

and it operates on a file level.

On Xcode 8 I use 2 fingers left / right

Beginning in XCode 3.2.3, the following key sequence works:

Cmd + Option + Shift + ←

Without the Shift key, it just goes back to the previous cursor position. Adding Shift jumps to the previous file (next file, in combination with →).