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-rw-r--r--lisp/button.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/button.el b/lisp/button.el
index f1ce1fff413..3345015f9b8 100644
--- a/lisp/button.el
+++ b/lisp/button.el
@@ -184,7 +184,7 @@ Buttons inherit them by setting their `category' property to that symbol."
(point-max))
prop val)))
-(defsubst button-activate (button use-mouse-action)
+(defsubst button-activate (button &optional use-mouse-action)
"Call BUTTON's action property.
If USE-MOUSE-ACTION is non-nil, invoke the button's mouse-action
instead of its normal action; if the button has no mouse-action,