width param in RichLog.write isn't respected

[darrenburns]

All renderables written to RichLog seem to be rendered at min_width width, even if I specifically request a width in the write method.

I think width should always be respected if passed as an argument to write, and we only use the RichLog.min_width fallback when no width has been explicitly requested by the developer.

Example:

rich_log = RichLog()
rich_log.write(Panel(...), width=20)
# the panel is rendered 78 characters wide, not 20.

An MRE as a snapshot test:

def test_richlog_write_at_specific_width(snap_compare):
    """Ensure we can write renderables at a specific width."""

    class RichLogWriteAtSpecificWidth(App[None]):
        CSS = "RichLog { width: 53; background: $accent;}"

        def compose(self) -> ComposeResult:
            yield RichLog(min_width=50)

    async def run_before(pilot):
        rich_log: RichLog = pilot.app.query_one(RichLog)
        panel = Text("foo", style="black on red", justify="center")
        rich_log.write(panel, width=20)
        rich_log.write(panel, width=40)
        rich_log.write(panel, width=60)

    assert snap_compare(RichLogWriteAtSpecificWidth(), run_before=run_before)

Output:

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