More correct window image (screenshot) without frame bounds

Author: AlexanderPro

WindowTextExtractor/Utils/WindowUtils.cs

@@ -302,7 +302,7 @@ public static WindowInformation GetWindowInformation(IntPtr handle, Point cursor
 
         public static Bitmap CaptureWindow(IntPtr handle, bool captureCursor = false)
         {
-            User32.GetWindowRect(handle, out var rectangle);
+            var rectangle = GetWindowRectWithoutMargins(handle);
             var posX = rectangle.Left;
             var posY = rectangle.Top;
             var width = rectangle.Width;
@@ -534,6 +534,21 @@ private static Color GetColorUnderCursor(Point cursorPosition)
             return color;
         }
 
+        private static Rect GetWindowRectWithoutMargins(IntPtr hWnd)
+        {
+            Rect size;
+            if (Environment.OSVersion.Version.Major < 6)
+            {
+                User32.GetWindowRect(hWnd, out size);
+            }
+            else if (Dwmapi.DwmGetWindowAttribute(hWnd, Constants.DWMWA_EXTENDED_FRAME_BOUNDS, out size, Marshal.SizeOf(typeof(Rect))) != 0)
+            {
+                User32.GetWindowRect(hWnd, out size);
+            }
+            return size;
+        }
+
+
         private class WmiProcessInfo
         {
             public string CommandLine { get; set; }