Bug 283631 [CSS] ETabFolder in CTabFolder mode top/bottom keylines differ
bundles/org.eclipse.e4.ui.widgets/src/org/eclipse/e4/ui/widgets/ETabFolder.java
if(!webbyStyle || onBottom || single) {
		return super.setItemLocation();
	}
	
	boolean changed = false;
	if (items.length == 0) return false;
	int y = borderTop;
	int rightItemEdge = getRightItemEdge();
	int maxWidth = rightItemEdge - borderLeft;
	int width = 0;
	for (int i = 0; i < priority.length; i++) {
		CTabItem item = items[priority[i]];
		width += item.width;
		item.showing = i == 0 ? true : item.width > 0 && width <= maxWidth;
	}
	int x = leftMargin;
	int defaultX = getDisplay().getBounds().width + 10; 
	firstIndex = items.length - 1;
	for (int i = 0; i < items.length; i++) {
		ETabItem item = (ETabItem) items[i];
		if (!item.showing) {
			if (item.x != defaultX) changed = true;
			item.x = defaultX;
		} else {
			firstIndex = Math.min(firstIndex, i);
			if (item.x != x || item.y != y) changed = true;
			item.x = x;
			item.y = y;
			if (i == selectedIndex) {
				int edge = Math.min(item.x + item.width, rightItemEdge);