tdf#89165 sw: looping layout in SwHeadFootFrm::FormatSize()

FormatObjsAtFrm() returns false, indicating that the result is not
perfect, and the caller hopes that formatting all children of the frame
again will help. Make sure that in case that assumption turns out to be false, we at
least do not loop.

The loop limit is enough to make the original i#43771 bugdoc still laid
out properly.

Change-Id: Ife9bd99a628a72edb922d04e05081971b6adf340

sw/qa/extras/ooxmlimport/ooxmlimport.cxx

@@ -2874,6 +2874,11 @@ DECLARE_OOXMLIMPORT_TEST(testTdf90810, "tdf90810short.docx")
     CPPUNIT_ASSERT_EQUAL(static_cast<sal_Int32>(90), static_cast<sal_Int32>(sFtnText.getLength()));
 }
 
+DECLARE_OOXMLIMPORT_TEST(testTdf89165, "tdf89165.docx")
+{
+    // This must not hang in layout
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

sw/source/core/layout/hffrm.cxx

@@ -246,6 +246,7 @@ void SwHeadFootFrm::FormatSize(SwTwips nUL, const SwBorderAttrs * pAttrs)
                     pFrm->_InvalidatePos();
                     aOldFooterPrtPos = Frm().Pos() + Prt().Pos();
                 }
+                int nLoopControl = 0;
                 while( pFrm )
                 {
                     pFrm->Calc(getRootFrm()->GetCurrShell()->GetOut());
@@ -263,9 +264,14 @@ void SwHeadFootFrm::FormatSize(SwTwips nUL, const SwBorderAttrs * pAttrs)
                         if ( !SwObjectFormatter::FormatObjsAtFrm( *pFrm,
                                                                   *(pFrm->FindPageFrm()) ) )
                         {
-                            // restart format with first content
-                            pFrm = Lower();
-                            continue;
+                            if (nLoopControl++ < 20)
+                            {
+                                // restart format with first content
+                                pFrm = Lower();
+                                continue;
+                            }
+                            else
+                                SAL_WARN("sw", "SwHeadFootFrm::FormatSize: loop detection triggered");
                         }
                     }
                     pFrm = pFrm->GetNext();