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Allow widget callback to be NULL (STR #2835).

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11812 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser 2016-07-15 19:23:32 +00:00
parent db05cd1a92
commit 9713905710
1 changed files with 1 additions and 0 deletions
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1
src/Fl_Widget.cxx
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@ -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;