Adding functionality to display an error when attempting to delete a comment

Author: StanleyGoldman

src/GitHub.InlineReviews/Views/CommentView.xaml

@@ -94,6 +94,23 @@
                                     Margin="0 2 0 0"
                                     Foreground="{DynamicResource VsBrush.WindowText}"
                                     Markdown="{Binding Body}"/>
+
+            <DockPanel Grid.Column="1" Grid.Row="2"
+                       Margin="0 4"
+                       HorizontalAlignment="Left" 
+                       TextBlock.Foreground="Red">
+                <DockPanel.Style>
+                    <Style TargetType="FrameworkElement">
+                        <Style.Triggers>
+                            <DataTrigger Binding="{Binding ErrorMessage}" Value="{x:Null}">
+                                <Setter Property="Visibility" Value="Collapsed"/>
+                            </DataTrigger>
+                        </Style.Triggers>
+                    </Style>
+                </DockPanel.Style>
+                <ui:OcticonImage DockPanel.Dock="Left" Icon="alert" Margin="0 0 4 0"/>
+                <TextBlock Text="{Binding ErrorMessage}" TextWrapping="Wrap"/>
+            </DockPanel>
         </StackPanel>
 
         <!-- Displays edit view or a reply placeholder-->