Case-insensitive Ctrl-key handling, man page update

nnn.1

@@ -380,11 +380,11 @@ separated by \fI;\fR:
     export NNN_MCLICK='p'
 
     NOTES:
-    1. You can use the '^\fIkey\fR' syntax to assign it to a \fICtrl+key\fR combo, e.g.:
+    1. To specify a \fICtrl+key\fR combo:
 
     export NNN_MCLICK='^A'
 
-    2. Otherwise, only the first character is taken into account.
+    2. Otherwise, only the first character is considered.
 .Ed
 .Pp
 \fBnnn:\fR this is a special variable set to the hovered entry before executing

src/nnn.h

@@ -32,7 +32,7 @@
 
 #include <curses.h>
 
-#define CONTROL(c) ((c) ^ 0x40)
+#define CONTROL(c) ((c) & 0x1f)
 
 /* Supported actions */
 enum action {