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,
	)

[TomJGooding]

After testing with the latest version (0.88.1), expanding the Select with the keyboard now seems to works as expected, but not when clicked with the mouse.

Maybe rather than self.call_after_refresh added on L523, should it be overlay.call_after_refresh...?

[willmcgugan]

That does appear to be a fix!

[willmcgugan]

But I can replicate the issue in the demo. Curious.

[TomJGooding]

It looks like this was resolved in #5314.

I noticed a difference in the scroll behaviour when first expanded with the mouse vs the keyboard, but that probably should be a new issue.

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