add API to FloatingTextEntry to force delete-on-focus-out

gtk2_ardour/floating_text_entry.cc

@@ -61,6 +61,12 @@ FloatingTextEntry::changed ()
 	entry_changed = true;
 }
 
+void
+FloatingTextEntry::delete_on_focus_out ()
+{
+	signal_focus_out_event().connect (sigc::mem_fun (*this, &FloatingTextEntry::entry_focus_out));
+}
+
 void
 FloatingTextEntry::on_realize ()
 {

gtk2_ardour/floating_text_entry.h

@@ -34,6 +34,7 @@ public:
 	 *  - move to previous editable field.
 	 */
 	sigc::signal2<void,std::string,int> use_text;
+	void delete_on_focus_out ();
 
 private:
 	Gtk::Entry entry;