uitest: detect real floating windows better

We use the FloatingWindow base class also for some windows that are not
independent. A good example is the hyperlink dialog.

Change-Id: I067ac0465de9ff3c8f9bc0c1a5c817a5e09d96e5
Reviewed-on: https://gerrit.libreoffice.org/40650Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

vcl/source/uitest/uiobject.cxx

@@ -97,7 +97,11 @@ bool isDialogWindow(vcl::Window const * pWindow)
 bool isTopWindow(vcl::Window const * pWindow)
 {
     WindowType eType = pWindow->GetType();
-    return eType == WindowType::FLOATINGWINDOW;
+    if (eType == WindowType::FLOATINGWINDOW)
+    {
+        return pWindow->GetStyle() & WB_SYSTEMFLOATWIN;
+    }
+    return false;
 }
 
 vcl::Window* get_top_parent(vcl::Window* pWindow)