This means that if one does “mate «folder»”, open a few files as tabs, and then close the window, next time the same folder is opened, TextMate will restore the tabs.
Presently state is remembered (when closing a window) either if the file browser is visible or if more than one document is open in the window.
We now explicitly disable it for targets that hasn’t yet been upgraded to ARC. This way, it’s easier to get an overview of which targets hasn’t yet been upgraded and ensures new targets has ARC enabled.