Terminal sometimes does not display newlines in Panel 1.5.0

[dennisjlee]

ALL software version info

Software Version Info

Panel==1.5.0
Bokeh==3.5.2
jupyterlab==4.2.4
notebook==7.2.1

Description of expected behavior and the observed behavior

I have a UI that is served to users via Jupyter Notebook, which includes a pn.widgets.Terminal to show output (sys.stdout and sys.stderr have been reassigned to point to the Terminal, as suggested in the Panel docs).

Complete, minimal, self-contained example code that reproduces the issue

Please see repro here: https://github.com/dennisjlee/panel-repro/tree/terminalBug

Essentially all I'm doing is running repeated print statements in a Jupyter notebook cell, like this

for i in range(3):
    print("hello")
    print("world")

Sometimes this results in 6 lines of output, and other times it results in one line with all the words squished together.

Note that I could not reproduce this bug with Panel 1.4.5 / Bokeh 3.4.3, and I also could not reproduce this bug using panel serve instead of a jupyter notebook.

Screenshots or screencasts of the bug in action

• I may be interested in making a pull request to address this

[hoxbro]

Does this still happen with print("hello", flush=True)?