Code completion produces bad results for indented lines

[andeplane]

Description

Code completion does not function well on indented lines. I tested with JupyterLab 4.1.5 in JupyterLite and regular upstream. They do not give the same result, but I can't figure out why.

Reproduce

If you enable completion (not inline), and write the following code into an empty cell in JupyterLite

import pandas as pd

Then in a new cell type in

for i in range(5):
    pd.

and press enter on the annotation completion suggestion.
You would expect that the new code would be

for i in range(5):
    .annotations

I used code completion and noticed this behaviour.

Context

• JupyterLite version: 2.1.3
• Operating System and version: MacOS 13.0
• Browser and version: Chrome 122.0.6261.128