The bug
The vertical scroll is not behaving the same between RichLog and Log. Both have auto_scroll to True by default. On a Log widget, the user can scroll up and the content stay at this place even if new line are written. On RichLog, the content goes back to the end when a new line is written.
It's similar to #6194 except that I don't use thread or anchor.
Example
from datetime import datetime
from textual.app import App, ComposeResult
from textual.widgets import Log, RichLog
class ExampleApp(App):
def compose(self) -> ComposeResult:
yield Log()
yield RichLog()
def on_mount(self) -> None:
self.set_interval(1.0, self.write_line)
def write_line(self) -> None:
log = self.query_one(Log)
log.write_line(str(datetime.now()) + ' normal')
rich_log = self.query_one(RichLog)
rich_log.write(str(datetime.now()) + ' rich')
if __name__ == '__main__':
app = ExampleApp()
app.run()
Textual Diagnostics
Versions
| Name |
Value |
| Textual |
7.0.0 |
| Rich |
14.2.0 |
Python
| Name |
Value |
| Version |
3.12.3 |
| Implementation |
CPython |
| Compiler |
GCC 13.3.0 |
| Executable |
/apollo/apollo/.venv/bin/python3 |
Operating System
| Name |
Value |
| System |
Linux |
| Release |
6.6.87.2-microsoft-standard-WSL2 |
| Version |
#1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 |
Terminal
| Name |
Value |
| Terminal Application |
vscode (1.107.0) |
| TERM |
xterm-256color |
| COLORTERM |
truecolor |
| FORCE_COLOR |
Not set |
| NO_COLOR |
Not set |
Rich Console options
| Name |
Value |
| size |
width=334, height=38 |
| legacy_windows |
False |
| min_width |
1 |
| max_width |
334 |
| is_terminal |
True |
| encoding |
utf-8 |
| max_height |
38 |
| justify |
None |
| overflow |
None |
| no_wrap |
False |
| highlight |
None |
| markup |
None |
| height |
None |
