A Keymap binding that is the same as a BINDING binding will break with symbol keys

[TomJGooding]

I have a similar problem that is probably related: applying a keymap containing a symbol key (like "?" or "/") will cause the keybinding to fail. Logging the value of app.active_bindings showed that before applying a keymap the key's value was "question" and after applying the keymap it was "?".

Here is a modified version of @davep 's code above to illustrate:

from textual.app import App, ComposeResult
from textual.binding import Binding
from textual.widgets import Button, Footer

class BadMapApp(App[None]):
    BINDINGS = [
        Binding("f1", "good", description="Good", id="good"),
        Binding("?", "bad", description="Bad", id="bad"),
    ]

    def compose(self) -> ComposeResult:
        yield Button("Break bad")
        yield Footer()

    def action_good(self) -> None:
        self.notify("Good")

    def action_bad(self) -> None:
        self.notify("Bad")

    def on_button_pressed(self) -> None:
        self.update_keymap({"bad": "?"})
        self.notify("? will no longer work now")

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

Originally posted by @mathman1618 in #5694

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[mathman1618]

Thanks for moving this to a new issue, @TomJGooding . I posted it in #5694 thinking that they had the same root problem, namely, that key strings from Keymaps are not preprocessed in the same way that key strings from Bindings are. Thanks also for making a PR so quickly!