Better panic autosaving

src/PixiEditor/Helpers/DeadlockDetectionHelper.cs

@@ -4,6 +4,8 @@ using System.Reflection;
 using System.Text;
 using System.Windows.Threading;
 using Microsoft.Diagnostics.Runtime;
+using PixiEditor.Extensions.Common.UserPreferences;
+using PixiEditor.Models.DataHolders;
 using PixiEditor.Views;
 using Exception = System.Exception;
 
@@ -94,8 +96,18 @@ public class DeadlockDetectionHelper
         var thread = new Thread(() =>
         {
             var viewModel = ViewModelMain.Current;
-
-            viewModel.AutosaveAllForNextSession();
+            
+            var list = new List<AutosaveFilePathInfo>();
+            foreach (var document in viewModel.DocumentManagerSubViewModel.Documents)
+            {
+                document.AutosaveViewModel.PanicAutosave();
+                if (document.AutosaveViewModel.LastSavedPath != null || document.FullFilePath != null)
+                {
+                    list.Add(new AutosaveFilePathInfo(document.FullFilePath, document.AutosaveViewModel.LastSavedPath));
+                }
+            }
+        
+            IPreferences.Current?.UpdateLocalPreference(PreferencesConstants.UnsavedNextSessionFiles, list);
         });
         
         thread.Start();

src/PixiEditor/ViewModels/SubViewModels/Document/AutosaveDocumentViewModel.cs

@@ -176,6 +176,19 @@ internal class AutosaveDocumentViewModel : NotifyableObject
         SafeAutosave(saveUserFileIfEnabled);
     }
 
+    public void PanicAutosave()
+    {
+        string filePath = Path.Join(Paths.PathToUnsavedFilesFolder, $"autosave-{tempGuid}.pixi");
+        Directory.CreateDirectory(Directory.GetParent(filePath)!.FullName);
+
+        var result = Exporter.TrySave(Document, filePath);
+
+        if (result == SaveResult.Success)
+        {
+            LastSavedPath = filePath;
+        }
+    }
+
     private void SafeAutosave(bool saveUserFile)
     {
         try