Allow blink-matching-paren to jump off screen

* doc/emacs/programs.texi (Matching): Mention the
`blink-matching-paren' value `jump-offscreen'.

* lisp/simple.el (blink-matching-paren): New possible value.
(blink-matching-paren-on-screen): Clarify the docstring.
(blink-matching-open): Handle `jump-offscreen' (bug#21286).

1 files changed, 2 insertions, 1 deletions

diff --git a/doc/emacs/programs.texi b/doc/emacs/programs.texi
index 2eb999d2c28..8f78a1a54b6 100644
--- a/doc/emacs/programs.texi
+++ b/doc/emacs/programs.texi
@@ -814,7 +814,8 @@ opening delimiter and closing delimiter are mismatched---such as in
 @code{blink-matching-paren} turns the feature on or off: @code{nil}
 disables it, but the default is @code{t} to enable it.  Set it to
 @code{jump} to make indication work by momentarily moving the cursor
-to the matching opening delimiter.
+to the matching opening delimiter.  Set it to @code{jump-offscreen} to
+make the cursor jump, even if the opening delimiter is off screen.
 
 @item
 @code{blink-matching-delay} says how many seconds to keep indicating