Fix: Bug involving popwin compatibility

Given a frame consisting of 3 windows placed side-by-side,
one of which being neotree and
the widths of the other two being different,
execution of the command `popwin:open-popup-window' results in
the left-most window being split vertically into two new windows,
one wide and one thin.

Author: Panagiotis Vlantis

neotree.el

@@ -886,11 +886,13 @@ The description of ARG is in `neotree-enter'."
          (around neotree/popwin-popup-buffer activate)
        (let ((neo-exists-p (neo-global--window-exists-p)))
          (when neo-exists-p
-           (neo-global--detach))
+           ;; (neo-global--detach)
+           (neotree-hide))
          ad-do-it
          (when neo-exists-p
-           (neo-global--attach)
-           (neo-global--reset-width))))
+           ;; (neo-global--attach)
+           ;; (neo-global--reset-width)
+           (neotree-show))))
 
      (defadvice popwin:close-popup-window
          (around neotree/popwin-close-popup-window activate)