Select initial value is out of view when first expanded

[TomJGooding]

When the Select widget is first expanded, the initial selected value is out of view when it appears further down in the list of options.

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


class SelectApp(App):
    def compose(self) -> ComposeResult:
        yield Select.from_values(
            range(20),
            value=15,
        )


if __name__ == "__main__":
    app = SelectApp()
    app.run()

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[TomJGooding]

I think the problem is when the Select is first expanded, where this calls OptionList.scroll_to_highlight the region values here are all zeros:

textual/src/textual/widgets/_option_list.py

Lines 891 to 896 in 8d99130

	self.scroll_to_region(
	Region(0, y, self.scrollable_content_region.width, height),
	force=True,
	animate=False,
	top=top,
	)