Add the conceal patch from Vince Negri.
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 7d5e6d6..fda756f 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -1163,6 +1163,13 @@
A variable name that is preceded with "w:" is local to the current window. It
is deleted when the window is closed.
+One local window variable is predefined:
+ *w:ownsyntax-variable* *ownsyntax*
+w:ownsyntax Set to 1 if the window has an independent syntax installed
+ via the |:ownsyntax| command. The default for a window is
+ 0. Syntax scripts can use this to determine whether they
+ should set b:current_syntax or w:current_syntax.
+
*tabpage-variable* *t:var*
A variable name that is preceded with "t:" is local to the current tab page,
It is deleted when the tab page is closed. {not available when compiled
@@ -5772,7 +5779,7 @@
Return the name of the undo file that would be used for a file
with name {name} when writing. This uses the 'undodir'
option, finding directories that exist. It does not check if
- the undo file exist.
+ the undo file exists.
{name} is always expanded to the full path, since that is what
is used internally.
Useful in combination with |:wundo| and |:rundo|.