Fix for WPF DPI issue on .net 3.1.19 (#13551)

src/modules/imageresizer/ui/App.xaml.cs

@@ -26,6 +26,8 @@ namespace ImageResizer
 
         protected override void OnStartup(StartupEventArgs e)
         {
+            // Fix for .net 3.1.19 making Image Resizer not adapt to DPI changes.
+            NativeMethods.SetProcessDPIAware();
             var batch = ResizeBatch.FromCommandLine(Console.In, e?.Args);
 
             // TODO: Add command-line parameters that can be used in lieu of the input page (issue #14)

src/modules/imageresizer/ui/Utilities/NativeMethods.cs

@@ -19,6 +19,9 @@ namespace ImageResizer.Utilities
         [DllImport("user32.dll")]
         internal static extern uint SendInput(uint nInputs, INPUT[] pInputs, int cbSize);
 
+        [DllImport("user32.dll", SetLastError = true)]
+        internal static extern bool SetProcessDPIAware();
+
         [StructLayout(LayoutKind.Sequential)]
         public struct INPUT
         {