Put messages under tasks in a subfolder

Author: KirillOsenkov

src/StructuredLogger/Analyzers/BuildAnalyzer.cs

@@ -371,6 +371,29 @@ private void AnalyzeTask(Task task)
 
             fileCopyMap.AnalyzeTask(task);
             doubleWritesAnalyzer.AnalyzeTask(task);
+
+            CollapseMessagesToSubfolder(task);
+        }
+
+        private void CollapseMessagesToSubfolder(Task task)
+        {
+            var messages = task.Children.OfType<Message>().ToArray();
+            if (messages.Length > 10)
+            {
+                for (int i = task.Children.Count - 1; i >= 0; i--)
+                {
+                    if (task.Children[i] is Message)
+                    {
+                        task.Children.RemoveAt(i);
+                    }
+                }
+            }
+
+            var subfolder = task.GetOrCreateNodeWithName<Folder>(Strings.Messages);
+            foreach (var message in messages)
+            {
+                subfolder.AddChild(message);
+            }
         }
 
         private void UpdateTaskDurations(Task task)

src/StructuredLogger/Strings/Strings.cs

@@ -618,6 +618,7 @@ public static Match IsFoundConflicts(string text)
         public static string Environment => "Environment";
         public static string TruncatedEnvironment => "Starting with MSBuild 17.4, only some environment variables are included in the log: the ones read during the build and the ones prefixed with MSBUILD, DOTNET_ or COMPLUS_.\nDefine MSBUILDLOGALLENVIRONMENTVARIABLES to log all environment variables during the build.";
         public static string Imports => "Imports";
+        public static string Messages => "Messages";
         public static string DetailedSummary => "Detailed summary";
         public static string Parameters => "Parameters";
         public static string Results => "Results";