Disabling frame suspending

1 files changed, 14 insertions, 4 deletions

diff --git a/smart-documents.org b/smart-documents.org
index d6c4a77..5e63bd4 100644
--- a/smart-documents.org
+++ b/smart-documents.org
@@ -377,12 +377,22 @@ The following bindings lead to more natural window & frame exit behaviors.
   (global-set-key (kbd "C-q") 'sd-delete-frame-or-kill-emacs)
 #+END_SRC
 
-*** Disable =C-z= if using a graphical interface
+*** Remap =C-z= when using a graphical interface
 
-#+BEGIN_SRC emacs-lisp :tangle yes
-(global-unset-key (kbd "C-z"))
+By default, =C-z= suspends the editor. This is extremely handy when
+the editor is started with the =-nw= option (no window, i.e. launched
+in a terminal), because it returns control to the terminal command
+line without quitting Emacs---it simply places the Emacs process in
+the background.  The user may then use the Linux job management tools
+to return inside the Emacs process.
+
+However, when using a graphical display, we have no need for
+suspending the frame, so we remap =C-z= to the much more sensible
+~undo~ behaviour.
 
-(global-set-key (kbd "C-z C-z") 'suspend-frame)
+#+BEGIN_SRC emacs-lisp :tangle yes
+  (when (display-graphic-p)
+    (global-set-key (kbd "C-z") 'undo))
 #+END_SRC
 
 ** Text display