Show number of comments on OpenConversation button

Author: jcansdale

src/GitHub.Exports/Models/IssueishDetailModel.cs

@@ -37,10 +37,15 @@ public class IssueishDetailModel
         /// Gets or sets the date/time at which the issue or pull request was last updated.
         /// </summary>
         public DateTimeOffset UpdatedAt { get; set; }
-        
+
         /// <summary>
         /// Gets or sets the comments on the issue or pull request.
         /// </summary>
         public IReadOnlyList<CommentModel> Comments { get; set; }
+
+        /// <summary>
+        /// Gets or sets the number of comments on the issue or pull request.
+        /// </summary>
+        public int CommentCount { get; set; }
     }
 }

src/GitHub.InlineReviews/Services/PullRequestSessionService.cs

@@ -313,6 +313,7 @@ public virtual async Task<PullRequestDetailModel> ReadPullRequestDetail(HostAddr
                         HeadRepositoryOwner = pr.HeadRepositoryOwner != null ? pr.HeadRepositoryOwner.Login : null,
                         State = pr.State.FromGraphQl(),
                         UpdatedAt = pr.UpdatedAt,
+                        CommentCount = pr.Comments(0, null, null, null).TotalCount,
                         Comments = pr.Comments(null, null, null, null).AllPages().Select(comment => new CommentModel
                         {
                             Id = comment.Id.Value,

src/GitHub.VisualStudio.UI/Views/GitHubPane/PullRequestDetailView.xaml

@@ -107,10 +107,7 @@
 
                 <StackPanel Orientation="Horizontal">
                     <ghfvs:OcticonImage Margin="0 2 4 0" Foreground="{DynamicResource VsBrush.GrayText}" Width="12" Height="12" Icon="comment"/>
-                    <ghfvs:GitHubActionLink Margin="0 6" Command="{Binding OpenConversation}">
-                        <!-- TODO: Needs hook up -->
-                        42
-                    </ghfvs:GitHubActionLink>
+                    <ghfvs:GitHubActionLink Margin="0 6" Command="{Binding OpenConversation}" Content="{Binding Model.CommentCount}" />
                 </StackPanel>
 
                 <Rectangle Margin="5 0" Width="1" Height="12" VerticalAlignment="Center" Style="{DynamicResource Separator}" />