store each solutions open tabs

src/SharpIDE.Godot/Features/CodeEditor/CodeEditorPanel.cs

@@ -7,6 +7,7 @@ using SharpIDE.Application.Features.Events;
 using SharpIDE.Application.Features.Run;
 using SharpIDE.Application.Features.SolutionDiscovery;
 using SharpIDE.Application.Features.SolutionDiscovery.VsPersistence;
+using SharpIDE.Godot.Features.IdeSettings;
 
 namespace SharpIDE.Godot.Features.CodeEditor;
 
@@ -30,7 +31,20 @@ public partial class CodeEditorPanel : MarginContainer
         tabBar.TabClosePressed += OnTabClosePressed;
 		GlobalEvents.Instance.DebuggerExecutionStopped.Subscribe(OnDebuggerExecutionStopped);
     }
-    
+
+    public override void _ExitTree()
+    {
+        var thisSolution = Singletons.AppState.RecentSlns.Single(s => s.FilePath == Solution.FilePath);
+        thisSolution.IdeSolutionState.OpenTabs = _tabContainer.GetChildren().OfType<SharpIdeCodeEdit>()
+            .Select(t => new OpenTab
+            {
+                FilePath = t.SharpIdeFile.Path,
+                CaretLine = t.GetCaretLine(),
+                CaretColumn = t.GetCaretColumn()
+            })
+            .ToList();
+    }
+
     public override void _UnhandledKeyInput(InputEvent @event)
     {
         if (@event.IsActionPressed(InputStringNames.StepOver))

src/SharpIDE.Godot/Features/IdeSettings/AppState.cs

@@ -16,4 +16,5 @@ public record RecentSln
 {
     public required string Name { get; set; }
     public required string FilePath { get; set; }
+    public IdeSolutionState IdeSolutionState { get; set; } = new IdeSolutionState();
 }

src/SharpIDE.Godot/Features/IdeSettings/IdeSolutionState.cs

@@ -0,0 +1,13 @@
+namespace SharpIDE.Godot.Features.IdeSettings;
+
+public class IdeSolutionState
+{
+    public List<OpenTab> OpenTabs { get; set; } = [];
+}
+
+public class OpenTab
+{
+    public required string FilePath { get; set; }
+    public required int CaretLine { get; set; }
+    public required int CaretColumn { get; set; }
+}

src/SharpIDE.Godot/IdeWindow.cs

@@ -82,7 +82,7 @@ public partial class IdeWindow : Control
             }
             ideRoot.SetSlnFilePath(slnPath);
             var recentSln = new RecentSln { FilePath = slnPath, Name = Path.GetFileName(slnPath) };
-            Singletons.AppState.RecentSlns.RemoveAll(s => s == recentSln); // Move to end (most recent)
+            Singletons.AppState.RecentSlns.RemoveAll(s => s.FilePath == recentSln.FilePath); // Move to end (most recent)
             Singletons.AppState.RecentSlns.Add(recentSln);
             
             await this.InvokeAsync(() =>