Bug 164939 [Forms] Form-based editor horizontal scroll pagesize too small
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/internal/forms/widgets/FormUtil.java
vbar.setPageIncrement(increment);
		}
	}
	public static void processKey(int keyCode, Control c) {
		ScrolledComposite scomp = FormUtil.getScrolledComposite(c);
		if (scomp != null) {
			if (c instanceof Combo)
				return;
			switch (keyCode) {
			case SWT.ARROW_DOWN:
				if (scomp.getData("novarrows") == null) 
					FormUtil.scrollVertical(scomp, false);
				break;
			case SWT.ARROW_UP:
				if (scomp.getData("novarrows") == null) 
					FormUtil.scrollVertical(scomp, true);
				break;
			case SWT.ARROW_LEFT:
				FormUtil.scrollHorizontal(scomp, true);
				break;
			case SWT.ARROW_RIGHT:
				FormUtil.scrollHorizontal(scomp, false);
				break;
			case SWT.PAGE_UP:
				FormUtil.scrollPage(scomp, true);
				break;
			case SWT.PAGE_DOWN:
				FormUtil.scrollPage(scomp, false);
				break;
			}