Use full path in undofile(). Updated docs.
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 4d983bf..7d5e6d6 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1286,7 +1286,7 @@
*v:char* *char-variable*
v:char Argument for evaluating 'formatexpr' and used for the typed
- character when using <expr> in an abbreviation |map-<expr>|.
+ character when using <expr> in an abbreviation |:map-<expr>|.
*v:charconvert_from* *charconvert_from-variable*
v:charconvert_from
@@ -5773,6 +5773,8 @@
with name {name} when writing. This uses the 'undodir'
option, finding directories that exist. It does not check if
the undo file exist.
+ {name} is always expanded to the full path, since that is what
+ is used internally.
Useful in combination with |:wundo| and |:rundo|.
When compiled without the +persistent_undo option this always
returns an empty string.