Fix more issues with the channels panel

* Put the newest notifications at the top
* Have at most 1 notification toast, which is non-interactive,
  but focuses the notification panel on click, and auto-dismisses
  on a timer.

crates/collab_ui/src/notifications/contact_notification.rs

@@ -1,106 +0,0 @@
-use crate::notifications::render_user_notification;
-use client::{User, UserStore};
-use gpui::{elements::*, Entity, ModelHandle, View, ViewContext};
-use std::sync::Arc;
-use workspace::notifications::Notification;
-
-pub struct ContactNotification {
-    user_store: ModelHandle<UserStore>,
-    user: Arc<User>,
-    notification: rpc::Notification,
-}
-
-#[derive(Clone, PartialEq)]
-struct Dismiss(u64);
-
-#[derive(Clone, PartialEq)]
-pub struct RespondToContactRequest {
-    pub user_id: u64,
-    pub accept: bool,
-}
-
-pub enum Event {
-    Dismiss,
-}
-
-impl Entity for ContactNotification {
-    type Event = Event;
-}
-
-impl View for ContactNotification {
-    fn ui_name() -> &'static str {
-        "ContactNotification"
-    }
-
-    fn render(&mut self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
-        match self.notification {
-            rpc::Notification::ContactRequest { .. } => render_user_notification(
-                self.user.clone(),
-                "wants to add you as a contact",
-                Some("They won't be alerted if you decline."),
-                |notification, cx| notification.dismiss(cx),
-                vec![
-                    (
-                        "Decline",
-                        Box::new(|notification, cx| {
-                            notification.respond_to_contact_request(false, cx)
-                        }),
-                    ),
-                    (
-                        "Accept",
-                        Box::new(|notification, cx| {
-                            notification.respond_to_contact_request(true, cx)
-                        }),
-                    ),
-                ],
-                cx,
-            ),
-            rpc::Notification::ContactRequestAccepted { .. } => render_user_notification(
-                self.user.clone(),
-                "accepted your contact request",
-                None,
-                |notification, cx| notification.dismiss(cx),
-                vec![],
-                cx,
-            ),
-            _ => unreachable!(),
-        }
-    }
-}
-
-impl Notification for ContactNotification {
-    fn should_dismiss_notification_on_event(&self, event: &<Self as Entity>::Event) -> bool {
-        matches!(event, Event::Dismiss)
-    }
-}
-
-impl ContactNotification {
-    pub fn new(
-        user: Arc<User>,
-        notification: rpc::Notification,
-        user_store: ModelHandle<UserStore>,
-    ) -> Self {
-        Self {
-            user,
-            notification,
-            user_store,
-        }
-    }
-
-    fn dismiss(&mut self, cx: &mut ViewContext<Self>) {
-        self.user_store.update(cx, |store, cx| {
-            store
-                .dismiss_contact_request(self.user.id, cx)
-                .detach_and_log_err(cx);
-        });
-        cx.emit(Event::Dismiss);
-    }
-
-    fn respond_to_contact_request(&mut self, accept: bool, cx: &mut ViewContext<Self>) {
-        self.user_store
-            .update(cx, |store, cx| {
-                store.respond_to_contact_request(self.user.id, accept, cx)
-            })
-            .detach();
-    }
-}