From 97139057106b6e9022c39ff46b2fc7b0dbcbf35c Mon Sep 17 00:00:00 2001
From: Albrecht Schlosser <albrechts.fltk@online.de>
Date: Fri, 15 Jul 2016 19:23:32 +0000
Subject: Allow widget callback to be NULL (STR #2835).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11812 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Widget.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Fl_Widget.cxx b/src/Fl_Widget.cxx
index 717f8efb9..ee6104354 100644
--- a/src/Fl_Widget.cxx
+++ b/src/Fl_Widget.cxx
@@ -321,6 +321,7 @@ Fl_Widget::copy_label(const char *a) {
 */
 void
 Fl_Widget::do_callback(Fl_Widget* o,void* arg) {
+  if (!callback_) return;
   Fl_Widget_Tracker wp(this);
   callback_(o,arg);
   if (wp.deleted()) return;
-- 
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