Smart Mouse Drags outside a Window

If dragged from an Emacs window to outside of Emacs:
  ACTION KEY
     (1) If depress was on a buffer name in Buffer-menu/ibuffer mode or on
         a file/directory in dired mode, display the item in a new frame.
         See hmouse-drag-item-mode-forms for how to allow for draggable
         items in other modes.
     (2) If depress was anywhere else, create a new frame sized to match the
         selected window with the same buffer.
  ASSIST KEY
     Create a new frame sized to match the selected window with the same buffer.
     If there is only one window in the source frame or if hycontrol-keep-window-flag
     is non-nil, leave the original window and just clone it into the new frame;
     otherwise, delete the original window.