use ask_exit payload in terminal console

avoid special frontend handling for ‘exit’

We really need to totally reconstruct how kernel shutdown works in the console interfaces, but at least this makes it behave as intended currently.

IPython/kernel/zmq/zmqshell.py

@@ -489,7 +489,7 b' class ZMQInteractiveShell(InteractiveShell):'
 
     def ask_exit(self):
         """Engage the exit actions."""
-        self.exit_now = True
+        self.exit_now = (not self.keepkernel_on_exit)
         payload = dict(
             source='ask_exit',
             exit=True,

IPython/terminal/console/interactiveshell.py

@@ -137,11 +137,6 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
         if self.has_readline:
             self.set_readline_completer()
     
-    def ask_exit(self):
-        super(ZMQTerminalInteractiveShell, self).ask_exit()
-        if self.exit_now and self.manager:
-            self.client.shutdown()
-    
     def run_cell(self, cell, store_history=True):
         """Run a complete IPython cell.
         
@@ -158,11 +153,7 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
             # pressing enter flushes any pending display
             self.handle_iopub()
             return
-
-        if cell.strip() == 'exit':
-            # explicitly handle 'exit' command
-            return self.ask_exit()
-
+        
         # flush stale replies, which could have been ignored, due to missed heartbeats
         while self.client.shell_channel.msg_ready():
             self.client.shell_channel.get_msg()
@@ -213,6 +204,8 b' class ZMQTerminalInteractiveShell(TerminalInteractiveShell):'
                         page.page(item['data']['text/plain'])
                     elif source == 'set_next_input':
                         self.set_next_input(item['text'])
+                    elif source == 'ask_exit':
+                        self.ask_exit()
                
             elif status == 'error':
                 for frame in content["traceback"]: