Make Title of a Collapsible Widget Editable

[ADevAJ]

Can not update title property of the Collapsible widget , looking at CollapsibleTitle class it seems to only set at init
Looks like this was an intentional choice ?
But I think it would be helpful to make the title property editable ,
Eg: changing content in the collapsed state and don't want to toggle it open to get a quick status update, so write something in .title...

from textual.app import App, ComposeResult
from textual.containers import Container, Horizontal, VerticalScroll
from textual.widgets import Header, Footer, Collapsible, Placeholder

class AnApp(App):

    TITLE = "Collapsible Titles Should Update"

    BINDINGS = [("d", "toggle_dark", "Update"),
    ("c", "collapse_or_expand(True)", "Collapse"),
    ("e", "collapse_or_expand(False)", "Expand")]
    
    def action_collapse_or_expand(self, collapse: bool) -> None:
        for child in self.walk_children(Collapsible):
            child.collapsed = collapse

    def compose(self) -> ComposeResult:
        """Create child widgets for the app."""
        yield Header(show_clock=True)
        yield VerticalScroll(
            Collapsible(
                Horizontal(
                 Placeholder(variant="text"),
                 Placeholder(variant="size"),
                 Placeholder(variant="text"),
            ),
            title="Top_Stuff",id="top"
            )
        )
        yield Footer()

    def action_toggle_dark(self) -> None:
        """An action to toggle dark mode."""
        top_collapsible_widget = self.query_one("#top")
        top_collapsible_widget.title = "UPDATED_Top_Stuff"
        self.app.title = "UPDATED_App_Title"
        self.dark = not self.dark


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

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[willmcgugan]

Not intentionally really. I can't think of a reason it shouldn't be editable.

Going to move this to ToDo as it seems an easy win. Would also accept a PR if you want to tackle it yourself!

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