Define 'ul destination' as dropped folder

src/main/java/tihwin/AwesomeMediator.java

@@ -1,6 +1,6 @@
 /*
 
-     Copyright "2022" Dmitry Isaenko
+     Copyright 2022-2023 Dmitry Isaenko
 
      This file is part of Tihwin.
 
@@ -36,5 +36,10 @@ public class AwesomeMediator {
         INSTANCE.mainAppUi.notifySplitFinished();
     }
 
-    public static void setDiskImage(File file){INSTANCE.mainAppUi.setDiskImageFile(file);}
+    public static void setDiskImage(File file){
+        INSTANCE.mainAppUi.setDiskImageFile(file);
+    }
+    public static void setDestination(File folder){
+        INSTANCE.mainAppUi.setDestinationDir(folder);
+    }
 }

src/main/java/tihwin/MainAppUi.java

@@ -1,5 +1,5 @@
 /*
-    Copyright 2022 Dmitry Isaenko
+    Copyright 2022-2023 Dmitry Isaenko
 
     This file is part of Tihwin.
 
@@ -152,7 +152,7 @@ public class MainAppUi extends JFrame {
             setDestinationDir(fileChooser.getSelectedFile());
     }
 
-    private void setDestinationDir(File folder) {
+    public void setDestinationDir(File folder) {
         destinationDirectoryLbl.setText(folder.getAbsolutePath());
     }
 

src/main/java/tihwin/ui/FilesDropListener.java

@@ -46,8 +46,10 @@ public class FilesDropListener extends DropTargetAdapter {
             List<File> files = (List<File>) transferable.getTransferData(DataFlavor.javaFileListFlavor);
 
             for (File file : files) {
-                if (file.isDirectory())
-                    continue;
+                if (file.isDirectory()){
+                    AwesomeMediator.setDestination(file);
+                    break;
+                }
                 // Pick up first ISO file found and drop iteration
                 if (file.getName().toLowerCase().endsWith(".iso")) {
                     AwesomeMediator.setDiskImage(file);