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/window/ApplicationWindow.java
static final int VGAP = 2;
			
		protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
			if (wHint != SWT.DEFAULT && hHint != SWT.DEFAULT)
				return new Point(wHint, hHint);
				
			Point result= new Point(0, 0);
			Control[] ws= composite.getChildren();
			for (int i= 0; i < ws.length; i++) {
				Control w= ws[i];
				
				boolean hide= false;
				if (getToolBarControl() == w) {
					if (!toolBarChildrenExist()) {
						hide= true;
						result.y+= 23;	
					} 
				} else if (statusLineManager != null && statusLineManager.getControl() == w) {
				} else if (i > 0) { 
					hide= false;
				}
				
				if (! hide) {
					Point e= w.computeSize(wHint, hHint, flushCache);
					result.x= Math.max(result.x, e.x);
					result.y+= e.y + VGAP;
				}
			}