Notification toaster does not handle throttled triggers

[paoloalba]

Software Version Info

python 3.12
bokeh 3.6.3
panel 1.6.0

Description of expected behavior and the observed behavior

toaster notification should work, but if a notification is triggered while another one is still showing, then they pile up, and are shown all at once after a new notification-trigger. After this, no notification is shown anymore.

Complete, minimal, self-contained example code that reproduces the issue

import panel as pn

print(pn.__version__)

pn.extension(notifications=True)

tmpl = pn.template.BootstrapTemplate(title="Test App")

def create_button(notificator):
    button = pn.widgets.Button(
        button_type="primary",
        icon="plus",
        name=f"{notificator}"
    )
    def create_notification(_):
        notificator("this is a notification!", duration=3*1000)
    button.on_click(create_notification)
    return button

tmpl.sidebar.append(create_button(pn.state.notifications.info))
tmpl.sidebar.append(create_button(pn.state.notifications.error))

tmpl.main.append(pn.pane.Markdown("# Test Text"))

tmpl.servable()

Stack traceback and/or browser JavaScript console output

Screenshots or screencasts of the bug in action

Registrazione.schermo.2025-02-06.alle.17.51.20.mov