WinForms: Add PNG/JFIF clipboard formats when copying

#264

NAPS2.Lib.WinForms/EtoForms/WinForms/WinFormsEtoPlatform.cs

@@ -242,6 +242,15 @@ public override void ConfigureZoomButton(Button button)
 
     public override void SetClipboardImage(Clipboard clipboard, ProcessedImage processedImage, IMemoryImage memoryImage)
     {
+        // We also add the JPEG/PNG format to the clipboard as some applications care about the actual format
+        // https://github.com/cyanfish/naps2/issues/264
+        var jpegOrPng = ImageExportHelper.SaveSmallestFormatToMemoryStream(memoryImage,
+            processedImage.Metadata.Lossless, -1, out var fileFormat);
+        var handler = (ClipboardHandler) clipboard.Handler;
+        // Note this only updates the DataObject, it doesn't set the clipboard, that's done in the
+        // base.SetClipboardImage(...) call below
+        handler.Control.SetData(fileFormat == ImageFileFormat.Jpeg ? "JFIF" : "PNG", jpegOrPng);
+
         if (memoryImage.PixelFormat is ImagePixelFormat.BW1 or ImagePixelFormat.Gray8)
         {
             // Storing 1bit/8bit images to the clipboard doesn't work, so we copy to 24bit if needed