feat(chat_handler): show extra info only once

Author: jellydn

rplugin/python3/handlers/chat_handler.py

@@ -18,6 +18,8 @@ def is_module_installed(name):
 
 # TODO: Abort request if the user closes the layout
 class ChatHandler:
+    has_show_extra_info = False
+
     def __init__(self, nvim: MyNvim, buffer: MyBuffer):
         self.nvim: MyNvim = nvim
         self.copilot: Copilot = None
@@ -247,7 +249,11 @@ def _add_end_separator(self, model: str, disable_separators: bool = False):
 
         end_message = model_info + additional_instructions + disclaimer
 
-        if disable_separators:
+        show_extra = disable_separators or ChatHandler.has_show_extra_info
+
+        if show_extra:
             end_message = "\n" + current_datetime + "\n\n---\n"
 
+        ChatHandler.has_show_extra_info = True
+
         self.buffer.append(end_message.split("\n"))