Look at why the animation of the tabs underline is still a bit slow about frogmouth

[davep]

Testing with a standalone bit of code:

from textual.app        import App, ComposeResult
from textual.binding    import Binding
from textual.containers import Horizontal, Vertical
from textual.widgets    import Header, Footer, TabbedContent, TabPane, Tabs, Label

class StandardTabs( Vertical ):

    def compose( self ) -> ComposeResult:
        with TabbedContent():
            for n in range( 10 ):
                with TabPane( f"Tab {n}" ):
                    yield Label( f"This is tab {n}" )

class SelfSwitchTabs( StandardTabs ):

    BINDINGS = [
        Binding( "a", "previous", "Previous" ),
        Binding( "d", "next", "Next" ),
    ]

    def action_previous(self) -> None:
        self.query_one(Tabs).action_previous_tab()

    def action_next(self) -> None:
        self.query_one(Tabs).action_next_tab()

class TabbedContentTesterApp( App[ None ] ):

    CSS = """
    StandardTabs:focus-within {
        background: $panel;
    }
    """

    def compose( self ) -> ComposeResult:
        yield Header()
        with Horizontal():
            yield StandardTabs()
            yield SelfSwitchTabs()
        yield Footer()

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

and I don't obviously see any sort of issue; using the Tabs itself vs using other bindings to call into the Tabs via its actions doesn't seem to make any difference. Both look the same speed.

[davep]

Handled by some improvements to Textual, and a slightly change to how/when focus is settled on a navigation pane in the application itself.