diff --color -U 5 -r -Z -B ./org/gtk/gtkwindow.c ./mod/gtk/gtkwindow.c
--- ./org/gtk/gtkwindow.c	2017-10-27 22:06:52.000000000 +0200
+++ ./mod/gtk/gtkwindow.c	2017-10-30 21:26:46.180337901 +0100
@@ -149,11 +149,11 @@
  *
  * GtkWindow adds the .titlebar and .default-decoration style classes to the
  * widget that is added as a titlebar child.
  */
 
-#define MNEMONICS_DELAY 300 /* ms */
+#define MNEMONICS_DELAY 0 /* ms */
 #define NO_CONTENT_CHILD_NAT 200
 /* In case the content (excluding header bar and shadows) of the window
  * would be empty, either because there is no visible child widget or only an
  * empty container widget, we use NO_CONTENT_CHILD_NAT as natural width/height
  * instead.