+ ownerCtComponentLayout, ownerCtContainerLayout,
+ curSize = this.lastComponentSize,
+ prevSize = this.previousComponentSize,
+ widthChange = (prevSize && curSize && Ext.isNumber(curSize.width )) ? curSize.width !== prevSize.width : true,
+ heightChange = (prevSize && curSize && Ext.isNumber(curSize.height)) ? curSize.height !== prevSize.height : true;
+
+ // If size has not changed, do not inform upstream layouts
+ if (!ownerCt || (!widthChange && !heightChange)) {