This leak is produced when copy and paste of text/numbers
is done in Calc/Writer.

Following is the trace produced by valgrind (trimmed)

  malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so)
  g_malloc (in /usr/lib64/libglib-2.0.so.0.4600.2)
  g_strdup (in /usr/lib64/libglib-2.0.so.0.4600.2)
  VclGtkClipboard::makeGtkTargetEntry(...) (gtk3gtkinst.cxx:467)
  VclGtkClipboard::setContents(...) (gtk3gtkinst.cxx:557)
  TransferableHelper::CopyToSelection(vcl::Window*) const (transfer.cxx:1019)
  ScTabView::CheckSelectionTransfer() (tabview3.cxx:319)
  ScTabView::UpdateAutoFillMark() (tabview3.cxx:144)
  ScTabView::SelectionChanged() (tabview3.cxx:365)
  ScViewFunc::PostPasteFromClip(ScRangeList const&, ScMarkData const&) (viewfun3.cxx:1753)
  ScViewFunc::PasteFromClip(...) (viewfun3.cxx:1415)
  ScClipUtil::PasteFromClipboard(ScViewData*, ScTabViewShell*, bool) (cliputil.cxx:69)
  ScCellShell::ExecuteEdit(SfxRequest&) (cellsh1.cxx:1285)
  SfxStubScCellShellExecuteEdit(SfxShell*, SfxRequest&) (scslots.hxx:7135)
  SfxShell::CallExec(void (*)(SfxShell*, SfxRequest&), SfxRequest&) (shell.hxx:206)
  SfxDispatcher::Call_Impl(SfxShell&, SfxSlot const&, SfxRequest&, bool) (dispatch.cxx:258)...
  ...

Change-Id: I12468e746f33a64e2b5f05e9ac1c6814c702ffd7
Reviewed-on: https://gerrit.libreoffice.org/20646Reviewed-by: jan iversen <jani@documentfoundation.org>
Tested-by: jan iversen <jani@documentfoundation.org>