message: Fix drag and drop of files to the Finder on macOS
diff: @@ -566,7 +566,7 @@ export class EmbeddedViewer extends ViewerElement implements Commandable,
  filename = "";
  }
  filename = path.basename(filename);
  - if (process.platform === "win32") {
  + if (process.platform === "win32" || process.platform === "darwin") {
  ev.dataTransfer.setData("DownloadURL", mimeType + ":" + filename + ":" + handle.getUrl() + "/" + filename);
  } else {
  ev.dataTransfer.setData("text/uri-list", handle.getUrl() + "/" + filename);
  