updated for version 7.3.141
Problem: When a key code is not set get a confusing error message.
Solution: Change the error message to say the key code is not set.
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 939a81d..9b15c58 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -150,6 +150,18 @@
(the ^[ is a real <Esc> here, use CTRL-V <Esc> to enter it)
The advantage over a mapping is that it works in all situations.
+You can define any key codes, e.g.: >
+ :set t_xy=^[foo;
+There is no warning for using a name that isn't recognized. You can map these
+codes as you like: >
+ :map <t_xy> something
+< *E846*
+When a key code is not set, it's like it does not exist. Trying to get its
+value will result in an error: >
+ :set t_kb=
+ :set t_kb
+ E846: Key code not set: t_kb
+
The t_xx options cannot be set from a |modeline| or in the |sandbox|, for
security reasons.