This is a port of Max Vohlken's window cloning patch,
which is part of his original patch for NEdit 5.0.2.
Use the menu Windows->Clone Tab to create a new window,
which is a clone of the invoking tab. Split panes will
also be cloned.
The tabs, window and icon titles will reflect the clone
status with an additional "<#>" appended to the
filenames, with # being the index of the clone.
As of v1.0, you can't move or detach a clone, but we
may expect this to change in the future version.