Bug 43410: Correct z-index ordering of iframes. This PlaceBehind() call is needed on Windows to cause the actual ::SetWindowPos system call that reorders the widgets to be made. Mac and Gtk do not implement PlaceBehind and should not be affected by this change. Fix includes work by beard@netscape.com. r=beard@netscape.com,self sr=jst@netscape.com

widget/src/xpwidgets/nsBaseWidget.cpp

@@ -312,6 +312,7 @@ NS_IMETHODIMP nsBaseWidget::SetZIndex(PRInt32 aZIndex)
 					if (NS_SUCCEEDED(childWidget->GetZIndex(&childZIndex))) {
 						if (aZIndex < childZIndex) {
 							parent->mChildren->InsertElementAt(this, index);
+							PlaceBehind(childWidget, PR_FALSE);
 							break;
 						}
 					}