Add support for SimpleMenu to use custom select options (#6480)

Co-authored-by: Jakub Kuczys <[email protected]>

redbot/core/utils/views.py

@@ -107,6 +107,17 @@ class SimpleMenu(discord.ui.View):
         under the select menu in this instance.
         Defaults to False.
 
+    Attributes
+    ----------
+    select_menu: `discord.ui.Select`
+        A select menu with a list of pages. The usage of this attribute is discouraged
+        as it may store different instances throughout the menu's lifetime.
+
+        .. deprecated-removed:: 3.5.14 60
+            Any behaviour enabled by the usage of this attribute should no longer be depended on.
+            If you need this for something and cannot replace it with the other functionality,
+            create an issue on Red's issue tracker.
+
     Examples
     --------
         You can provide a list of strings::
@@ -269,6 +280,11 @@ async def start(
                 Send the message ephemerally. This only works
                 if the context is from a slash command interaction.
         """
+        if self.use_select_menu and self.source.is_paginating():
+            self.remove_item(self.select_menu)
+            # we added a default one in init so we want to remove it and add any changes here
+            self.select_menu = self._get_select_menu()
+            self.add_item(self.select_menu)
         self._fallback_author_to_ctx = True
         if user is not None:
             self.author = user
@@ -285,6 +301,11 @@ async def start_dm(self, user: discord.User):
             user: `discord.User`
                 The user that will be direct messaged by the bot.
         """
+        if self.use_select_menu and self.source.is_paginating():
+            self.remove_item(self.select_menu)
+            # we added a default one in init so we want to remove it and add any changes here
+            self.select_menu = self._get_select_menu()
+            self.add_item(self.select_menu)
         self.author = user
         kwargs = await self.get_page(self.current_page)
         self.message = await user.send(**kwargs)