When using the “remember last position” setting, if the resolution or dpi has changed, the position will be rescaled proportionally

Author: onesounds

Flow.Launcher/MainWindow.xaml.cs

@@ -27,6 +27,7 @@
 using System.Windows.Media;
 using System.Windows.Interop;
 using System.Runtime.InteropServices;
+using System.Drawing;
 
 namespace Flow.Launcher
 {
@@ -48,6 +49,10 @@ public partial class MainWindow
 
         private MediaPlayer animationSoundWMP;
         private SoundPlayer animationSoundWPF;
+        private double _previousScreenWidth;
+        private double _previousScreenHeight;
+        private double _previousDpiX;
+        private double _previousDpiY;
 
         #endregion
 
@@ -288,16 +293,38 @@ private void OnLoaded(object sender, RoutedEventArgs _)
             };
         }
 
+        private (double X, double Y) GetCurrentDpi(Screen screen)
+        {
+            using (Graphics g = Graphics.FromHwnd(IntPtr.Zero))
+            {
+                return (g.DpiX, g.DpiY);
+            }
+        }
         private void InitializePosition()
         {
+            var screen = SelectedScreen();
+            var currentDpi = GetCurrentDpi(screen);
+            double currentScreenWidth = screen.WorkingArea.Width;
+            double currentScreenHeight = screen.WorkingArea.Height;
+
+            if (_previousScreenWidth != 0 && _previousScreenHeight != 0 && _previousDpiX != 0 && _previousDpiY != 0)
+            {
+                double widthRatio = currentScreenWidth / _previousScreenWidth;
+                double heightRatio = currentScreenHeight / _previousScreenHeight;
+                double dpiXRatio = currentDpi.X / _previousDpiX;
+                double dpiYRatio = currentDpi.Y / _previousDpiY;
+
+                _settings.WindowLeft *= widthRatio * dpiXRatio;
+                _settings.WindowTop *= heightRatio * dpiYRatio;
+            }
+
             if (_settings.SearchWindowScreen == SearchWindowScreens.RememberLastLaunchLocation)
             {
                 Top = _settings.WindowTop;
                 Left = _settings.WindowLeft;
             }
             else
             {
-                var screen = SelectedScreen();
                 switch (_settings.SearchWindowAlign)
                 {
                     case SearchWindowAligns.Center:
@@ -323,6 +350,10 @@ private void InitializePosition()
                 }
             }
 
+            _previousScreenWidth = currentScreenWidth;
+            _previousScreenHeight = currentScreenHeight;
+            _previousDpiX = currentDpi.X;
+            _previousDpiY = currentDpi.Y;
         }
 
         private void UpdateNotifyIconText()