feature: execute children search asynchronously

Author: czarkoff

src/Commands/QueryCommitChildren.cs

@@ -15,19 +15,19 @@ public QueryCommitChildren(string repo, string commit, string filters)
             Args = $"rev-list --parents {filters} ^{commit}";
         }
 
-        public IEnumerable<string> Result()
+        protected override void OnReadline(string line)
         {
-            var rs = ReadToEnd();
-            if (!rs.IsSuccess)
-                yield break;
+            if (line.Contains(_commit))
+                _lines.Add(line);
+        }
 
-            foreach (string s in rs.StdOut.Split('\n', StringSplitOptions.None))
-            {
-                if (s.Contains(_commit))
-                    yield return s.Substring(0, 40);
-            }
+        public IEnumerable<string> Result()
+        {
+            Exec();
+            return _lines;
         }
 
         private string _commit;
+        private List<string> _lines = new List<string>();
     }
 }

src/ViewModels/CommitDetail.cs

@@ -538,16 +538,19 @@ private void Refresh()
                 Dispatcher.UIThread.Invoke(() => SignInfo = signInfo);
             });
 
-            Task.Run(() =>
-            {
-                var children = new Commands.QueryCommitChildren(_repo.FullPath, _commit.SHA, _repo.Settings.BuildHistoriesFilter()).Result();
-                Dispatcher.UIThread.Invoke(() => Children.AddRange(children));
-            });
-
             if (_cancelToken != null)
                 _cancelToken.Requested = true;
 
             _cancelToken = new Commands.Command.CancelToken();
+
+            Task.Run(() =>
+            {
+                var cmdChildren = new Commands.QueryCommitChildren(_repo.FullPath, _commit.SHA, _repo.Settings.BuildHistoriesFilter()) { Cancel = _cancelToken };
+                var children = cmdChildren.Result();
+                if (!cmdChildren.Cancel.Requested)
+                    Dispatcher.UIThread.Post(() => Children.AddRange(children));
+            });
+
             Task.Run(() =>
             {
                 var parent = _commit.Parents.Count == 0 ? "4b825dc642cb6eb9a060e54bf8d69288fbee4904" : _commit.Parents[0];