Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/wizard/WizardDialog.java
*/
		public Point computeSize(Composite composite, int wHint, int hHint, boolean force) {
		    if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT)
		        return new Point(wHint, hHint);
		    Point result = null;
		    Control[] children = composite.getChildren();
		    if (children.length > 0) {
		        result = new Point(0, 0);
		        for (int i = 0; i < children.length; i++) {
		            Point cp = children[i].computeSize(wHint, hHint, force);
		            result.x = Math.max(result.x, cp.x);
		            result.y = Math.max(result.y, cp.y);
		        }
		        result.x = result.x + 2 * marginWidth;
		        result.y = result.y + 2 * marginHeight;
		    } else {
		        Rectangle rect = composite.getClientArea();
		        result = new Point(rect.width, rect.height);
		    }
		    result.x = Math.max(result.x, minimumWidth);
		    result.y = Math.max(result.y, minimumHeight);
		    if (wHint != SWT.DEFAULT)
		        result.x = wHint;
		    if (hHint != SWT.DEFAULT)
		        result.y = hHint;
		    return result;
		}
		/**
		 * Returns the client area for the given composite according to this layout.
		 *