Bug 12720 Can't DND into non-source folder in Packages view
Build 20020321 In the Packages view, I can drag a file from the file system onto a project, a package or a source folder. However I cannot drag it onto a non-source folder. I can, however, drag the file onto the project, and then drag it into the non- source folder from within the packages view. The packages view should allow me to drag a file into any folder, just like in the Navigator view.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/FileTransferDropAdapter.java
ProgressMonitorDialog dialog= new ProgressMonitorDialog(shell);
			
			try {
				dialog.run(true, true, op);
			} catch (InvocationTargetException e) {
				String title= PackagesMessages.getString("DropAdapter.errorTitle"); 
				String message= PackagesMessages.getString("DropAdapter.errorMessage"); 
				ExceptionHandler.handle(e, title, message);
				return;
			} catch (InterruptedException e) {
				return;
			}
			
			
			IStatus status= op.getStatus();
			if (! status.isOK()) {
				String title= PackagesMessages.getString("DropAdapter.errorTitle"); 
				String message= PackagesMessages.getString("DropAdapter.errorMessage"); 
				ErrorDialog.openError(shell,
					title,
					message,
					status, IStatus.ERROR | IStatus.WARNING);
				return;
			}
			
			event.data= files.toArray(new String[files.size()]);
			
			event.detail= DND.DROP_COPY;
			return;