Backport: Provide missing let definition to prevent background void-variable error.

* lisp/allout-widgets.el (allout-widgets-exposure-change-processor)
Let-declare handled-conceal, for reference through `(symbol-value)'
within the let body. (Because the error happens in an
after-change-functions hook, so it is caught and reported as a message
by allout-widgets-hook-error-handler.)

(cherry picked from commit 3c410b6b4753e02269bb36914e7534eb124150dd)

diff --git a/lisp/allout-widgets.el b/lisp/allout-widgets.el
index e7750b3606e5c0c3069f2e31f5923cb92bfd2438..64f2ba500d9452c3f2f6876836c41ae2cdb497f9 100644 (file)
--- a/lisp/allout-widgets.el
+++ b/lisp/allout-widgets.el
@@ -988,6 +988,7 @@ Generally invoked via `allout-exposure-change-functions'."
         ;; have to distinguish between concealing and exposing so that, eg,
         ;; `allout-expose-topic's mix is handled properly.
         handled-expose
+        handled-conceal
         covered
         deactivate-mark)