Rich help ignores CliRunner terminal_width

[AIlord1501]

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Example Code

import typer
from typer.testing import CliRunner

app = typer.Typer()

@app.command()
def cmd(
    name: str = typer.Option(
        help=(
            "A very long help message that should wrap when "
            "the terminal is narrow."
        ),
    ),
) -> None:
    pass


runner = CliRunner()

result = runner.invoke(
    app,
    ["cmd", "--help"],
    terminal_width=40,
)

print(result.output)

Description

When using Typer's Rich help rendering, the terminal_width passed to CliRunner is not respected.

I expected:

runner.invoke(app, ["cmd", "--help"], terminal_width=40)

to render the Rich help output within the requested terminal width.

Instead, the Rich help output is rendered significantly wider than 40 columns.

I reproduced this locally on the current Typer source.

I also verified that the existing test suite passes and created a regression test demonstrating the behavior.

Operating System

Windows

Operating System Details

Windows 11
PowerShell

Project Version

Current master branch

Python Version

Python 3.12.10

Additional Context

The issue appears specifically in the Rich help rendering path.

The Click context contains the requested terminal_width, but the Rich Console was previously created using MAX_WIDTH instead of the context's terminal_width.

For example, with terminal_width=40, the rendered Rich help panel still extends beyond the requested width.

I also confirmed the behavior with a focused pytest regression test.

Before the change:

• the regression test failed

After the change:

• 1384 passed
• 18 skipped
• 2 xfailed

The relevant change is to propagate ctx.terminal_width to the Rich console used by rich_format_help().