Adds UI for showing the followed-by status to collaboration

crates/workspace/src/workspace.rs

@@ -1623,6 +1623,7 @@ impl Workspace {
             project_id,
             leader_id: Some(leader_id),
         });
+
         Some(cx.spawn_weak(|this, mut cx| async move {
             let response = request.await?;
             if let Some(this) = this.upgrade(&cx) {
@@ -1719,6 +1720,10 @@ impl Workspace {
         self.follower_states_by_leader.contains_key(&peer_id)
     }
 
+    pub fn is_followed(&self, peer_id: PeerId) -> bool {
+        self.leader_state.followers.contains(&peer_id)
+    }
+
     fn render_titlebar(&self, theme: &Theme, cx: &mut RenderContext<Self>) -> ElementBox {
         let project = &self.project.read(cx);
         let mut worktree_root_names = String::new();
@@ -1896,6 +1901,9 @@ impl Workspace {
                         .to_proto(),
                 )
             });
+
+            cx.notify();
+
             Ok(proto::FollowResponse {
                 active_view_id,
                 views: this
@@ -1928,10 +1936,11 @@ impl Workspace {
         _: Arc<Client>,
         mut cx: AsyncAppContext,
     ) -> Result<()> {
-        this.update(&mut cx, |this, _| {
+        this.update(&mut cx, |this, cx| {
             this.leader_state
                 .followers
                 .remove(&envelope.original_sender_id()?);
+            cx.notify();
             Ok(())
         })
     }