Change list of buttons to show up as rows and not cols

readthedocs/misc/v2-migration-guide.rst

@@ -204,6 +204,33 @@ either ``.md_text`` or ``.html_text`` as needed. This is because both ``.text``
 may disappear in future versions, and their behaviour is not immediately obvious.
 
 
+Using a flat list to define buttons will now create rows and not columns
+------------------------------------------------------------------------
+
+When sending a message with buttons under a bot account, passing a flat list such as the following:
+
+.. code-block:: python
+
+    bot.send_message(chat, message, buttons=[
+        Button.inline('top'),
+        Button.inline('middle'),
+        Button.inline('bottom'),
+    ])
+
+Will now send a message with 3 rows of buttons, instead of a message with 3 columns (old behaviour).
+If you still want the old behaviour, wrap the list inside another list:
+
+.. code-block:: python
+
+    bot.send_message(chat, message, buttons=[[
+        #                                   +
+        Button.inline('top'),
+        Button.inline('middle'),
+        Button.inline('bottom'),
+    ]])
+    #+
+
+
 The Conversation API has been removed
 -------------------------------------
 

telethon/_client/buttons.py

@@ -8,7 +8,7 @@ from ..types import _custom
 def build_reply_markup(
         buttons: 'typing.Optional[hints.MarkupLike]',
         inline_only: bool = False) -> 'typing.Optional[_tl.TypeReplyMarkup]':
-    if buttons is None:
+    if not buttons:
         return None
 
     try:
@@ -18,9 +18,9 @@ def build_reply_markup(
         pass
 
     if not utils.is_list_like(buttons):
-        buttons = [[buttons]]
-    elif not buttons or not utils.is_list_like(buttons[0]):
         buttons = [buttons]
+    if not utils.is_list_like(buttons[0]):
+        buttons = [[b] for b in buttons]
 
     is_inline = False
     is_normal = False