ofz#57800 Timeout

Change-Id: I14b4906ce61b3d8a86cb9a766986c49e0b0e6abc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/150171
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

lotuswordpro/source/filter/lwplayout.cxx

@@ -370,7 +370,7 @@ bool LwpVirtualLayout::IsStyleLayout()
 LwpVirtualLayout* LwpVirtualLayout::FindChildByType(LWP_LAYOUT_TYPE eType)
 {
     LwpObjectID* pID = &GetChildHead();
-    LwpVirtualLayout* pPrevLayout = nullptr;
+    o3tl::sorted_vector<LwpVirtualLayout*> aSeen;
 
     while (pID && !pID->IsNull())
     {
@@ -378,14 +378,13 @@ LwpVirtualLayout* LwpVirtualLayout::FindChildByType(LWP_LAYOUT_TYPE eType)
         if (!pLayout)
             break;
 
-        if (pPrevLayout && pLayout == pPrevLayout)
+        bool bAlreadySeen = !aSeen.insert(pLayout).second;
+        if (bAlreadySeen)
         {
             SAL_WARN("lwp", "loop in layout");
             break;
         }
 
-        pPrevLayout = pLayout;
-
         if (pLayout->GetLayoutType() == eType)
             return pLayout;