profile: don't auto-load followers

This is a bandwidth-intensive operation

Changelog-Changed: Don't auto-load follower count

damus/Models/FollowersModel.swift

@@ -12,12 +12,19 @@ class FollowersModel: ObservableObject {
     let target: String
     var needs_sub: Bool = true
     
-    @Published var contacts: [String] = []
+    @Published var contacts: [String]? = nil
     var has_contact: Set<String> = Set()
     
     let sub_id: String = UUID().description
     let profiles_id: String = UUID().description
     
+    var count_display: String {
+        guard let contacts = self.contacts else {
+            return "?"
+        }
+        return "\(contacts.count)";
+    }
+    
     init(damus_state: DamusState, target: String) {
         self.damus_state = damus_state
         self.target = target
@@ -49,13 +56,13 @@ class FollowersModel: ObservableObject {
             contacts: damus_state.contacts,
             pubkey: damus_state.pubkey, ev: ev
         )
-        contacts.append(ev.pubkey)
+        contacts?.append(ev.pubkey)
         has_contact.insert(ev.pubkey)
     }
     
     func load_profiles(relay_id: String) {
         var filter = NostrFilter.filter_profiles
-        let authors = find_profiles_to_fetch_pk(profiles: damus_state.profiles, event_pubkeys: contacts)
+        let authors = find_profiles_to_fetch_pk(profiles: damus_state.profiles, event_pubkeys: contacts ?? [])
         if authors.isEmpty {
             return
         }

damus/Views/FollowingView.swift

@@ -47,7 +47,7 @@ struct FollowersView: View {
         let profile = damus_state.profiles.lookup(id: whos)
         ScrollView {
             LazyVStack(alignment: .leading) {
-                ForEach(followers.contacts, id: \.self) { pk in
+                ForEach(followers.contacts ?? [], id: \.self) { pk in
                     FollowUserView(target: .pubkey(pk), damus_state: damus_state)
                 }
             }

damus/Views/ProfileView.swift

@@ -201,20 +201,33 @@ struct ProfileView: View {
                 }
                 let fview = FollowersView(damus_state: damus_state, whos: profile.pubkey)
                     .environmentObject(followers)
-                NavigationLink(destination: fview) {
+                if followers.contacts != nil {
-                    HStack {
+                    NavigationLink(destination: fview) {
-                        Text("\(followers.contacts.count)")
+                        FollowersCount
-                            .font(.subheadline.weight(.medium))
-                        Text("Followers")
-                            .font(.subheadline)
-                            .foregroundColor(.gray)
                     }
+                    .buttonStyle(PlainButtonStyle())
+                } else {
+                    FollowersCount
+                        .onTapGesture {
+                            UIImpactFeedbackGenerator(style: .light).impactOccurred()
+                            followers.contacts = []
+                            followers.subscribe()
+                        }
                 }
-                .buttonStyle(PlainButtonStyle())
             }
         }
     }
     
+    var FollowersCount: some View {
+        HStack {
+            Text("\(followers.count_display)")
+                .font(.subheadline.weight(.medium))
+            Text("Followers")
+                .font(.subheadline)
+                .foregroundColor(.gray)
+        }
+    }
+    
     var body: some View {
         VStack(alignment: .leading) {
             ScrollView {
@@ -237,7 +250,7 @@ struct ProfileView: View {
         }
         .onDisappear {
             profile.unsubscribe()
-            //followers.unsubscribe()
+            followers.unsubscribe()
             // our profilemodel needs a bit more help
         }
     }