Bug 72434 [Workbench] Toolbars in CTabItems not rendering in RIGHT_TO_LEFT
bundles/org.eclipse.jface/src/org/eclipse/jface/util/Geometry.java
if (rect.width < 0) {
            rect.width = -rect.width;
            rect.x -= rect.width;
        }
        if (rect.height < 0) {
            rect.height = -rect.height;
            rect.y -= rect.height;
        }
    }
    /**
     * Converts the given rectangle from display coordinates to the local coordinate system 
     * of the given object into display coordinates.
     * 
     * @param coordinateSystem local coordinate system being converted to
     * @param toConvert rectangle to convert
     * @return a rectangle in control coordinates
     * @since 3.0
     */
    public static Rectangle toControl(Control coordinateSystem,
            Rectangle toConvert) {
        Point start = coordinateSystem.toControl(toConvert.x, toConvert.y);
        return new Rectangle(start.x, start.y, toConvert.width,
                toConvert.height);
    }
    /**
     * Converts the given rectangle from the local coordinate system of the given object
     * into display coordinates.
     * 
     * @param coordinateSystem local coordinate system being converted from
     * @param toConvert rectangle to convert