Fixup : test and fix CI errors

Author: elsazac

bundles/org.eclipse.e4.ui.workbench.renderers.swt/src/org/eclipse/e4/ui/workbench/renderers/swt/StackRenderer.java

@@ -89,8 +89,6 @@
 import org.eclipse.swt.custom.CTabItem;
 import org.eclipse.swt.dnd.DND;
 import org.eclipse.swt.dnd.DropTarget;
-import org.eclipse.swt.dnd.TextTransfer;
-import org.eclipse.swt.dnd.Transfer;
 import org.eclipse.swt.events.ControlEvent;
 import org.eclipse.swt.events.ControlListener;
 import org.eclipse.swt.events.MouseAdapter;
@@ -726,11 +724,8 @@ public Object createWidget(MUIElement element, Object parent) {
 		if (PartStackUtil.isEditorStack(element)) {
 			createOnboardingControls(tabFolder);
 			initializeOnboardingInformationInEditorStack(tabFolder);
-			Label dropLabel = new Label(tabFolder, SWT.NONE);
-			dropLabel.setText("Drop here"); //$NON-NLS-1$
-			int drop = DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK;
-			DropTarget target = new DropTarget(dropLabel, drop);
-			target.setTransfer(new Transfer[] { TextTransfer.getInstance() }); // or FileTransfer, etc.
+			Shell shell = Display.getCurrent().getActiveShell();
+			new DropTarget(shell, DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK);
 		}
 		tabFolder.setMRUVisible(getMRUValue());
 		// Adjust the minimum chars based on the location