Auto width results in zero-width when applied to OptionList

[darrenburns]

It seems like the virtual_size might not be getting set correctly inside OptionList.

In the app below I'd expect the OptionList to be able to render at the maximum cell width in the child Lines.

This app:

from textual.app import App, ComposeResult
from textual.widgets import OptionList

class OptionListAutoWidth(App[None]):
    CSS = "OptionList{ width: auto; }"

    def compose(self) -> ComposeResult:
        yield OptionList(*["one", "two", "three"])

app = OptionListAutoWidth()
app.run()

Produces this result:

Marking as a bug for now - feel free to update if I'm misunderstand.

[willmcgugan]

It's a line API widget. Looks like it is missing a get_content_width method.

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