Bug 323389 Prompt required when resetting perspectives from the perspective switcher
We prompt in 3.x, so we should prompt in 4.x.
bundles/org.eclipse.e4.ui.workbench.addons.swt/src/org/eclipse/e4/ui/workbench/addons/perspectiveswitcher/PerspectiveSwitcher.java
simpleCurveClose[index++] = bounds.width;
		simpleCurveClose[index++] = bounds.height;
		r.subtract(simpleCurveClose);
		Region clipping = new Region();
		gc.getClipping(clipping);
		r.intersect(clipping);
		gc.setClipping(r);
		Image b = toolParent.getBackgroundImage();
		if (b != null && !b.isDisposed())
			gc.drawImage(b, 0, 0);
		r.dispose();
		clipping.dispose();
		
		
		
		
	}
	void resize() {
		Point size = comp.getSize();
		Image oldBackgroundImage = backgroundImage;
		backgroundImage = new Image(comp.getDisplay(), size.x, size.y);
		GC gc = new GC(backgroundImage);
		comp.getParent().drawBackground(gc, 0, 0, size.x, size.y, 0, 0);
		Color background = comp.getBackground();
		Color border = comp.getDisplay().getSystemColor(SWT.COLOR_WIDGET_NORMAL_SHADOW);
		RGB backgroundRGB = background.getRGB();
		
		Color gradientTop = new Color(comp.getDisplay(), backgroundRGB.red + 12,
				backgroundRGB.green + 10, backgroundRGB.blue + 10);
		int h = size.y;