Component classes in content markup?

[TomJGooding]

I think this is undocumented but I was curious to try out this feature added in #5981:

Allow compnent classes in content markup when prefixed with a dot, e.g. "This is Python: [.inline-code]import this[/]"

Perhaps I've misunderstood how this works, but a quick test with Textual v5.1.0 crashes with a MarkupError?

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


class ContentExample(Static):
    COMPONENT_CLASSES = {"inline-code"}

    DEFAULT_CSS = """
    ContentExample {
        .inline-code {
            color: red;
            text-style: bold;
        }
    }
    """


class ExampleApp(App):
    def compose(self) -> ComposeResult:
        yield ContentExample("This is Python: [.inline-code]import this[/]")


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

[willmcgugan]

It is used in the Markdown class where the Content is constructed manually, and it works there. This appears to be a bug in the markup. I would suspect the regex that parses the tags

[TomJGooding]

Thanks Will for confirming. I just wasn't sure if I'd missed something looking at the markdown changes.