Understanding focus logic in ContentSwitcher

[robvanderleek]

I'm using ContentSwitcher to collect user input in a number of steps.
For example, a minimal example with two Input widgets looks like this:

#!/usr/bin/env -S uv run --script

# /// script
# dependencies = [
#   "textual>=6.1.0",
# ]
# ///

from textual.app import App
from textual.widgets import ContentSwitcher
from textual.widgets import Input
from textual.widgets import Static
from textual.containers import Container

class TestApp(App):

    def on_input_submitted(self):
        cs = self.query_one(ContentSwitcher)
        if cs.current == 'input-0':
            cs.current = 'input-1'
        else:
            self.app.exit()

    def compose(self):
        with ContentSwitcher(initial='input-0'):
            yield Input(id='input-0')
            yield Input(id='input-1')

if __name__ == '__main__':
    TestApp().run(inline=True)

This works fine, as the user fills in the first input and submits, the second input will automatically receive the focus.

However, if one of the ContentSwitcher widgets is a composite, the second input will not automatically be focussed:

#!/usr/bin/env -S uv run --script

# /// script
# dependencies = [
#   "textual>=6.1.0",
# ]
# ///

from textual.app import App
from textual.widgets import ContentSwitcher
from textual.widgets import Input
from textual.widgets import Static
from textual.containers import Container

class TestApp(App):

    def on_input_submitted(self):
        cs = self.query_one(ContentSwitcher)
        if cs.current == 'input-0':
            cs.current = 'input-1'
        else:
            self.app.exit()

    def compose(self):
        with ContentSwitcher(initial='input-0'):
            with Container(id='input-0'):
                yield Input()
            yield Input(id='input-1')

if __name__ == '__main__':
    TestApp().run(inline=True)

I know I can manually focus the second input, but I was wondering why the second input does not receive the focus automatically in the second example.