Lock SolarMutex around fmFormShell::DetermineForms calls

At least in JunitTest_forms_unoapi there are calls via URP of

SfxShell::UIFeatureChanged
FmFormShell::DetermineForms
FmXFormShell::elementInserted
cppu::OInterfaceContainerHelper::NotifySingleListener<...>::operator()
cppu::OInterfaceContainerHelper::forEach<...>
cppu::OInterfaceContainerHelper::notifyEach<...>
frm::OInterfaceContainer::implInsert
frm::OInterfaceContainer::insertByName
frm::OFormsCollection::insertByName
...

where SfxShell::UIFeatureChanged does an svtools::AsynchronLink::Call, and there
are notorious crashes during JunitTest_forms_unoapi in

vcl::Window::ImplRemoveDel
Application::RemoveUserEvent
svtools::AsynchronLink::~AsynchronLink
SfxShell_Impl::~SfxShell_Impl
SfxShell::~SfxShell
FmFomrShell::~FmFormShell
...

and the naive hope is that the former's unlocked operations cause some
corruption that make the latter operate on a dangling AsynchronLink::_nEventId.

(As always, the question is at which level to lock the solar mutex;
frm::OFormsCollection et al appear to be properly mutex'ed, FmXFormShell appears
to be virtually un-mutex'ed, except for some smelly m_aInvalidationSafety and
m_aAsyncSafety, and FmFormShell and SfxShell appear to run under the assumption
that the solar mutex is always locked.  So stick the guards into FmXFormShell---
which is the only place calling DetermineForms---under the assumption that that
is the most likely place needing general mutex clean-up in the future, and thus
bears the highest chance the potentially becoming redundant guards will be
noticed again.)

Change-Id: Iad0f4bd9af2bf62330e26ac50edd170f470e79c4

1 files changed, 5 insertions, 0 deletions

diff --git a/svx/source/form/fmshimp.cxx b/svx/source/form/fmshimp.cxx
index 3ba69ccd7c1b..e76c4f11bfce 100644
--- a/svx/source/form/fmshimp.cxx
+++ b/svx/source/form/fmshimp.cxx
@@ -2548,6 +2548,8 @@ void FmXFormShell::elementInserted(const ContainerEvent& evt) throw(::com::sun::
     Reference< XInterface> xTemp;
     evt.Element >>= xTemp;
     AddElement(xTemp);
+
+    SolarMutexGuard g;
     m_pShell->DetermineForms(true);
 }
 
@@ -2573,6 +2575,8 @@ void FmXFormShell::elementRemoved(const ContainerEvent& evt) throw(::com::sun::s
     Reference< XInterface> xTemp;
     evt.Element >>= xTemp;
     RemoveElement(xTemp);
+
+    SolarMutexGuard g;
     m_pShell->DetermineForms(true);
 }
 
@@ -2598,6 +2602,7 @@ void FmXFormShell::UpdateForms( bool _bInvalidate )
         AddElement( m_xForms );
     }
 
+    SolarMutexGuard g;
     m_pShell->DetermineForms( _bInvalidate );
 }