Falcon NL 7 years ago • updated by Nick 6 years ago 2
Currently, dragging the last file file from a window to a different or new window leaves behind an empty window, which in the vast majority of cases you'll want to close. I suggest closing the window automatically once the last file has been removed.

Forum topic: http://www.sublimetext.com/forum/viewtopic.php?f=4&t=1532
I was about to add the same suggestion, would be a nice addition to Sublime.
With close_windows_when_empty is set to true clicking the "x" on the last tab closes the window, but dragging out the tab does not.... I wish it would! :)