by attempting to set the parent as un-joinable for the duration of the
Cut/Paste in order to ensure it survives the process

==14185== Invalid read of size 8
==14185==    at 0x27AB1CF4: SwLayoutFrm::Lower() (layfrm.hxx:108)
==14185==    by 0x27FE3FD4: SwFlowFrm::PasteTree(SwFrm*, SwLayoutFrm*, SwFrm*, SwFrm*) (flowfrm.cxx:455)
==14185==    by 0x27FE4597: SwFlowFrm::MoveSubTree(SwLayoutFrm*, SwFrm*) (flowfrm.cxx:584)
==14185==    by 0x2801CF8B: SwCntntFrm::MoveFtnCntFwd(bool, SwFtnBossFrm*) (ftnfrm.cxx:2753)
==14185==    by 0x27FE7C29: SwFlowFrm::MoveFwd(bool, bool, bool) (flowfrm.cxx:1795)

==14185==  Address 0x11a74da8 is 168 bytes inside a block of size 288 free'd
==14185==    by 0x2808CAC8: SwSectionFrm::~SwSectionFrm() (sectfrm.cxx:153)
==14185==    by 0x2808DCC5: SwSectionFrm::MergeNext(SwSectionFrm*) (sectfrm.cxx:453)
==14185==    by 0x2808EC4B: SwSectionFrm::MakeAll() (sectfrm.cxx:713)
==14185==    by 0x27FCD000: SwFrm::PrepareMake() (calcmove.cxx:306)
==14185==    by 0x27DCAAC1: SwFrm::Calc() const (frame.hxx:996)
==14185==    by 0x27FE3EB9: SwFlowFrm::CutTree(SwFrm*) (flowfrm.cxx:418)
==14185==    by 0x27FE4577: SwFlowFrm::MoveSubTree(SwLayoutFrm*, SwFrm*) (flowfrm.cxx:583)
==14185==    by 0x2801CF8B: SwCntntFrm::MoveFtnCntFwd(bool, SwFtnBossFrm*) (ftnfrm.cxx:2753)
==14185==    by 0x27FE7C29: SwFlowFrm::MoveFwd(bool, bool, bool) (flowfrm.cxx:1795)

Change-Id: If96d845fdf22726df513b0dabd2764ad60c85987