Extract progress view, show video details loading

Shared/Player/CommentsView.swift

@@ -14,7 +14,7 @@ struct CommentsView: View {
                 Text("No comments")
                     .foregroundColor(.secondary)
             } else if !comments.loaded {
-                progressView
+                PlaceholderProgressView()
                     .onAppear {
                         comments.load()
                     }
@@ -60,19 +60,6 @@ struct CommentsView: View {
         }
         .padding(.horizontal)
     }
-
-    private var progressView: some View {
-        VStack {
-            Spacer()
-
-            HStack {
-                Spacer()
-                ProgressView()
-                Spacer()
-            }
-            Spacer()
-        }
-    }
 }
 
 struct CommentsView_Previews: PreviewProvider {

Shared/Player/PlaybackBar.swift

@@ -99,7 +99,7 @@ struct PlaybackBar: View {
             return "LIVE"
         }
 
-        guard player.time != nil, player.time!.isValid, !player.currentVideo.isNil else {
+        guard !player.isLoadingVideo else {
             return "loading..."
         }
 

Shared/Player/VideoDetails.swift

@@ -97,8 +97,12 @@ struct VideoDetails: View {
 
             switch currentPage {
             case .info:
-                ScrollView(.vertical) {
-                    detailsPage
+                if player.isLoadingVideo {
+                    PlaceholderProgressView()
+                } else {
+                    ScrollView(.vertical) {
+                        detailsPage
+                    }
                 }
             case .queue:
                 PlayerQueueView(sidebarQueue: $sidebarQueue, fullScreen: $fullScreen)