restore settings window size and position

src/settings-ui/PowerToys.Settings/Helpers/NativeMethods.cs

@@ -0,0 +1,21 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace PowerToys.Settings.Helpers
+{
+    public static class NativeMethods
+    {
+        internal const int SW_SHOWNORMAL = 1;
+        internal const int SW_SHOWMAXIMIZED = 3;
+
+        [DllImport("user32.dll")]
+        internal static extern bool SetWindowPlacement(IntPtr hWnd, ref WINDOWPLACEMENT lpwndpl);
+
+        [DllImport("user32.dll")]
+        internal static extern bool GetWindowPlacement(IntPtr hWnd, out WINDOWPLACEMENT lpwndpl);
+    }
+}

src/settings-ui/PowerToys.Settings/Helpers/POINT.cs

@@ -0,0 +1,25 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace PowerToys.Settings.Helpers
+{
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1815:Override equals and operator equals on value types", Justification = "Interop")]
+    public struct POINT
+    {
+        public int X { get; set; }
+
+        public int Y { get; set; }
+
+        public POINT(int x, int y)
+        {
+            X = x;
+            Y = y;
+        }
+    }
+}

src/settings-ui/PowerToys.Settings/Helpers/RECT.cs

@@ -0,0 +1,31 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace PowerToys.Settings.Helpers
+{
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1815:Override equals and operator equals on value types", Justification = "Interop")]
+    public struct RECT
+    {
+        public int Left { get; set; }
+
+        public int Top { get; set; }
+
+        public int Right { get; set; }
+
+        public int Bottom { get; set; }
+
+        public RECT(int left, int top, int right, int bottom)
+        {
+            Left = left;
+            Top = top;
+            Right = right;
+            Bottom = bottom;
+        }
+    }
+}

src/settings-ui/PowerToys.Settings/Helpers/WINDOWPLACEMENT.cs

@@ -0,0 +1,27 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace PowerToys.Settings.Helpers
+{
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
+    [System.Diagnostics.CodeAnalysis.SuppressMessage("Performance", "CA1815:Override equals and operator equals on value types", Justification = "Interop")]
+    public struct WINDOWPLACEMENT
+    {
+        public int Length { get; set; }
+
+        public int Flags { get; set; }
+
+        public int ShowCmd { get; set; }
+
+        public POINT MinPosition { get; set; }
+
+        public POINT MaxPosition { get; set; }
+
+        public RECT NormalPosition { get; set; }
+    }
+}

src/settings-ui/PowerToys.Settings/MainWindow.xaml.cs

@@ -3,12 +3,16 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.ComponentModel;
+using System.Drawing;
 using System.Windows;
+using System.Windows.Interop;
 using Microsoft.PowerLauncher.Telemetry;
 using Microsoft.PowerToys.Settings.UI.Library.Utilities;
 using Microsoft.PowerToys.Settings.UI.Views;
 using Microsoft.PowerToys.Telemetry;
 using Microsoft.Toolkit.Wpf.UI.XamlHost;
+using PowerToys.Settings.Helpers;
 using Windows.ApplicationModel.Resources;
 using Windows.Data.Json;
 
@@ -28,8 +32,6 @@ public MainWindow()
 
             this.InitializeComponent();
 
-            Utils.FitToScreen(this);
-
             ResourceLoader loader = ResourceLoader.GetForViewIndependentUse();
             Title = loader.GetString("SettingsWindow_Title");
 
@@ -55,6 +57,35 @@ public void NavigateToSection(Type type)
             }
         }
 
+        protected override void OnSourceInitialized(EventArgs e)
+        {
+            base.OnSourceInitialized(e);
+
+            Utils.FitToScreen(this);
+
+            var handle = new WindowInteropHelper(this).Handle;
+            NativeMethods.GetWindowPlacement(handle, out var startupPlacement);
+            var placement = Utils.DeserializePlacementOrDefault(handle);
+            NativeMethods.SetWindowPlacement(handle, ref placement);
+
+            var windowRect = new Rectangle((int)Left, (int)Top, (int)Width, (int)Height);
+            var screenRect = new Rectangle((int)SystemParameters.VirtualScreenLeft, (int)SystemParameters.VirtualScreenTop, (int)SystemParameters.VirtualScreenWidth, (int)SystemParameters.VirtualScreenHeight);
+            var intersection = Rectangle.Intersect(windowRect, screenRect);
+
+            // Windows is offscreen
+            if (intersection.Width <= 10 || intersection.Height <= 10)
+            {
+                NativeMethods.SetWindowPlacement(handle, ref startupPlacement);
+            }
+        }
+
+        protected override void OnClosing(CancelEventArgs e)
+        {
+            base.OnClosing(e);
+            var handle = new WindowInteropHelper(this).Handle;
+            Utils.SerializePlacement(handle);
+        }
+
         private void WindowsXamlHost_ChildChanged(object sender, EventArgs e)
         {
             // If sender is null, it could lead to a NullReferenceException. This might occur on restarting as admin (check https://github.com/microsoft/PowerToys/issues/7393 for details)

src/settings-ui/PowerToys.Settings/Utils.cs

@@ -2,12 +2,19 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+using System.Text.Json;
 using System.Windows;
+using PowerToys.Settings.Helpers;
 
 namespace PowerToys.Settings
 {
     internal class Utils
     {
+        private static string _placementPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), @"Microsoft\PowerToys\settings-placement.json");
+
         public static void FitToScreen(Window window)
         {
             if (SystemParameters.WorkArea.Width < window.Width)
@@ -66,5 +73,30 @@ public static void ShowHide(Window window)
             window.MinWidth = originalMinWidth;
             window.ShowInTaskbar = true;
         }
+
+        public static WINDOWPLACEMENT DeserializePlacementOrDefault(IntPtr handle)
+        {
+            if (!File.Exists(_placementPath))
+            {
+                _ = NativeMethods.GetWindowPlacement(handle, out var defaultPlacement);
+                return defaultPlacement;
+            }
+
+            var json = File.ReadAllText(_placementPath);
+            var placement = JsonSerializer.Deserialize<WINDOWPLACEMENT>(json);
+
+            placement.Length = Marshal.SizeOf(typeof(WINDOWPLACEMENT));
+            placement.Flags = 0;
+            placement.ShowCmd = placement.ShowCmd == NativeMethods.SW_SHOWMAXIMIZED ? NativeMethods.SW_SHOWMAXIMIZED : NativeMethods.SW_SHOWNORMAL;
+
+            return placement;
+        }
+
+        public static void SerializePlacement(IntPtr handle)
+        {
+            _ = NativeMethods.GetWindowPlacement(handle, out var placement);
+            var json = JsonSerializer.Serialize(placement);
+            File.WriteAllText(_placementPath, json);
+        }
     }
 }