Fixes VSTS Bug 1027417: [FATAL] SigTerm signal in

MonoDevelop.VersionControl.Git.dll!MonoDevelop.VersionControl.Git.TaskFailureExtensions::RunWaitAndCapture+0

https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1027417

Not connected to the original bug.

Author: mkrueger

main/src/addins/VersionControl/MonoDevelop.VersionControl.Git/Gui/MonoDevelop.VersionControl.Git.StashManagerDialog.cs

@@ -131,7 +131,6 @@ protected virtual void Build ()
 			}
 			this.DefaultWidth = 575;
 			this.DefaultHeight = 367;
-			this.Show ();
 			this.buttonApplyRemove.Clicked += new global::System.EventHandler (this.OnButtonApplyRemoveClicked);
 			this.buttonApply.Clicked += new global::System.EventHandler (this.OnButtonApplyClicked);
 			this.buttonBranch.Clicked += new global::System.EventHandler (this.OnButtonBranchClicked);

main/src/addins/VersionControl/MonoDevelop.VersionControl.Git/MonoDevelop.VersionControl.Git/GitService.cs

@@ -124,8 +124,14 @@ public static void ShowMergeDialog (GitRepository repo, bool rebasing)
 
 		public static void ShowStashManager (GitRepository repo)
 		{
-			using (var dlg = new StashManagerDialog (repo))
-				MessageService.ShowCustomDialog (dlg);
+			var dlg = new StashManagerDialog ();
+			Task.Run (async delegate {
+				await dlg.InitializeAsync (repo);
+				await Runtime.RunInMainThread (delegate {
+					MessageService.ShowCustomDialog (dlg);
+					dlg.Dispose ();
+				});
+			});
 		}
 
 		public static async Task<bool> SwitchToBranchAsync (GitRepository repo, string branch)

main/src/addins/VersionControl/MonoDevelop.VersionControl.Git/MonoDevelop.VersionControl.Git/StashManagerDialog.cs

@@ -29,38 +29,44 @@
 using MonoDevelop.Ide;
 using LibGit2Sharp;
 using System.Threading.Tasks;
+using System.Threading;
 
 namespace MonoDevelop.VersionControl.Git
 {
 	partial class StashManagerDialog : Gtk.Dialog
 	{
-		readonly GitRepository repository;
-		readonly ListStore store;
-		readonly StashCollection stashes;
+		GitRepository repository;
+		ListStore store;
+		StashCollection stashes;
 
-		public StashManagerDialog (GitRepository repo)
+		public StashManagerDialog ()
 		{
 			this.Build ();
 			this.UseNativeContextMenus ();
-			repository = repo;
-
-			stashes = repo.GetStashes ();
+		}
 
-			store = new ListStore (typeof(Stash), typeof(string), typeof(string));
-			list.Model = store;
-			list.SearchColumn = -1; // disable the interactive search
+		public async Task InitializeAsync(GitRepository repo, CancellationToken cancellationToken = default)
+		{
+			repository = repo;
+			stashes = await repo.GetStashesAsync (cancellationToken);
 
-			list.AppendColumn (GettextCatalog.GetString ("Date/Time"), new CellRendererText (), "text", 1);
-			list.AppendColumn (GettextCatalog.GetString ("Comment"), new CellRendererText (), "text", 2);
-			Fill ();
-			TreeIter it;
-			if (store.GetIterFirst (out it))
-				list.Selection.SelectIter (it);
-			UpdateButtons ();
+			await Runtime.RunInMainThread (delegate {
+				store = new ListStore (typeof (Stash), typeof (string), typeof (string));
+				list.Model = store;
+				list.SearchColumn = -1; // disable the interactive search
 
-			list.Selection.Changed += delegate {
+				list.AppendColumn (GettextCatalog.GetString ("Date/Time"), new CellRendererText (), "text", 1);
+				list.AppendColumn (GettextCatalog.GetString ("Comment"), new CellRendererText (), "text", 2);
+				Fill ();
+				TreeIter it;
+				if (store.GetIterFirst (out it))
+					list.Selection.SelectIter (it);
 				UpdateButtons ();
-			};
+
+				list.Selection.Changed += delegate {
+					UpdateButtons ();
+				};
+			});
 		}
 
 		void Fill ()