[BUG] Text inside Live with vertical_overflow="visible" duplicating when above console.height instead of scrolling

[RasyiidWho]

• [x] I've checked docs and closed issues for possible solutions.
• [x] I can't find my issue in the FAQ.

Describe the bug

I try to create function to streaming from incoming text using both rich.markdown and rich.live. In this example, I use simple number loop with the delay to simulate the streaming. Here's the simple example:

import time
from rich.markdown import Markdown
from rich.live import Live

def stream_numbers(chunk_size=1):
    for i in range(1, 11, chunk_size):
        yield f"\n\n{i}"
        time.sleep(0.01)


render_this = ""
with Live(render_this, auto_refresh=False, vertical_overflow="visible") as live:
    print(f"Console height: {live.console.height}")
    for entry in stream_numbers():
        render_this += entry
        live.update(Markdown(render_this), refresh=True)

Result:

1
1
(newline)
[...]
(newline)
10

Expected result: Output scrolling after excess console.height,

1
(newline)
[...]
(newline)
10

Result only breaking (duplicating) only when loop are above console.height. In this example, my console height are 18, and I try to print above it (19 newline).

Platform

Click to expand

Windows 11 with Python 3.10, Trying in: VSCode Terminal, Windows Terminal, and Cmder

╭───────────────────────── <class 'rich.console.Console'> ─────────────────────────╮
│ A high level console interface.                                                  │
│                                                                                  │
│ ╭──────────────────────────────────────────────────────────────────────────────╮ │
│ │ <console width=100 ColorSystem.TRUECOLOR>                                    │ │
│ ╰──────────────────────────────────────────────────────────────────────────────╯ │
│                                                                                  │
│     color_system = 'truecolor'                                                   │
│         encoding = 'utf-8'                                                       │
│             file = <_io.TextIOWrapper name='<stdout>' mode='w' encoding='utf-8'> │
│           height = 24                                                            │
│    is_alt_screen = False                                                         │
│ is_dumb_terminal = False                                                         │
│   is_interactive = True                                                          │
│       is_jupyter = False                                                         │
│      is_terminal = True                                                          │
│   legacy_windows = False                                                         │
│         no_color = False                                                         │
│          options = ConsoleOptions(                                               │
│                        size=ConsoleDimensions(width=100, height=24),             │
│                        legacy_windows=False,                                     │
│                        min_width=1,                                              │
│                        max_width=100,                                            │
│                        is_terminal=True,                                         │
│                        encoding='utf-8',                                         │
│                        max_height=24,                                            │
│                        justify=None,                                             │
│                        overflow=None,                                            │
│                        no_wrap=False,                                            │
│                        highlight=None,                                           │
│                        markup=None,                                              │
│                        height=None                                               │
│                    )                                                             │
│            quiet = False                                                         │
│           record = False                                                         │
│         safe_box = True                                                          │
│             size = ConsoleDimensions(width=100, height=24)                       │
│        soft_wrap = False                                                         │
│           stderr = False                                                         │
│            style = None                                                          │
│         tab_size = 8                                                             │
│            width = 100                                                           │
╰──────────────────────────────────────────────────────────────────────────────────╯
╭── <class 'rich._windows.WindowsConsoleFeatures'> ───╮
│ Windows features available.                         │
│                                                     │
│ ╭─────────────────────────────────────────────────╮ │
│ │ WindowsConsoleFeatures(vt=True, truecolor=True) │ │
│ ╰─────────────────────────────────────────────────╯ │
│                                                     │
│ truecolor = True                                    │
│        vt = True                                    │
╰─────────────────────────────────────────────────────╯
╭────── Environment Variables ───────╮
│ {                                  │
│     'TERM': None,                  │
│     'COLORTERM': None,             │
│     'CLICOLOR': None,              │
│     'NO_COLOR': None,              │
│     'TERM_PROGRAM': None,          │
│     'COLUMNS': None,               │
│     'LINES': None,                 │
│     'JUPYTER_COLUMNS': None,       │
│     'JUPYTER_LINES': None,         │
│     'JPY_PARENT_PID': None,        │
│     'VSCODE_VERBOSE_LOGGING': None │
│ }                                  │
╰────────────────────────────────────╯
platform="Windows"

[github-actions[bot]]

We found the following entry in the FAQ which you may find helpful:

• Why does content in square brackets disappear?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

This is an automated reply, generated by FAQtory

[willmcgugan]

It isn't possible to update content that has been scrolled off screen using Live. If you want something more dynamic, see Textual.