Add a mechanism to de-register a Terminal() that's being destroyed

terminatorlib/container.py

@@ -84,6 +84,7 @@ class Container(object):
         if not self.remove(widget):
             return(False)
 
+        self.terminator.deregister_terminal(widget)
         self.emit('need_group_hoover')
         return(True)
 

terminatorlib/newterminator.py

@@ -44,6 +44,11 @@ class Terminator(Borg):
 
         self.terminals.append(terminal)
 
+    def deregister_terminal(self, terminal):
+        """De-register a terminal widget"""
+
+        self.terminals.remove(terminal)
+
     def reconfigure_terminals(self):
         """Tell all terminals to update their configuration"""