Updating FooterKey description doesn't work first time?

[TomJGooding]

I've been experimenting with updating the binding descriptions with the new Footer widget in v.0.63. This involves the FooterKey which I appreciate isn't part of the public API, but I'd like to understand why the update isn't working only on the first update.

from textual.app import App, ComposeResult
from textual.widgets import Footer
from textual.widgets._footer import FooterKey


class DynamicBindingsApp(App):
    BINDINGS = [("space", "update_footer", "Count: 0")]

    count = 0

    def compose(self) -> ComposeResult:
        yield Footer()

    def action_update_footer(self) -> None:
        self.count += 1
        footer_key = self.query_one(FooterKey)
        footer_key.description = f"Count: {self.count}"
        footer_key.refresh()

        if self.count < 2:
            self.notify(
                "Footer description is not updated first time.",
                severity="error",
                timeout=1,
            )


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

[willmcgugan]

I wouldn't expect this to work. There is no current blessed way of updating the description dynamically. Updating the description like that would be reset when the bindings changed with focus etc.

[TomJGooding]

Thanks Will for your reply. I completely understand there's no blessed way of updating the description dynamically, but I was curious to understand why the code above seemed to work apart from the first update. It looks like this actually does now work with v0.63.6 so I'll have a closer look at those changes rather than bothering you further.