List items in a Markdown can receive focus

[davep]

It's possible that there are other items within Markdown for which this is true, and when I get a moment to test this more I'll update this issue if this is the case, but right now a Markdown that is showing markdown text that has ordered or unordered lists within it will have the focus chain work through each of the list items.

This can be seen by running this code and pressing Tab often:

from textual.app        import App, ComposeResult
from textual.containers import VerticalScroll
from textual.widgets    import Header, Footer, Markdown

MARKDOWN = """\
# Header

## Sub Header

- List
- List
- List
- List
- List
- List

1. Another List
1. Another List
1. Another List
1. Another List
1. Another List
1. Another List
"""

class MarkdownFocusApp( App[ None ] ):

    CSS = """
    *:focus {
        border: double red;
    }
    """

    def compose( self ) -> ComposeResult:
        yield Header()
        with VerticalScroll():
            yield Markdown(MARKDOWN)
        yield Footer()

if __name__ == "__main__":
    MarkdownFocusApp().run()

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