tdf#92392 - Dispose ScFormulaReferenceHelper properly.

Release the accelerator, and cleanup global references.

Change-Id: Id9931527f1b6d89067bc1e520e521ccfa6e28197
Reviewed-on: https://gerrit.libreoffice.org/16740Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
Tested-by: Michael Meeks <michael.meeks@collabora.com>

sc/source/ui/inc/anyrefdg.hxx

@@ -74,6 +74,7 @@ class ScFormulaReferenceHelper
 public:
     ScFormulaReferenceHelper(IAnyRefDialog* _pDlg,SfxBindings* _pBindings);
     ~ScFormulaReferenceHelper();
+    void dispose();
 
     void                ShowSimpleReference(const OUString& rStr);
     void                ShowFormulaReference(const OUString& rStr);

sc/source/ui/miscdlgs/anyrefdg.cxx

@@ -64,18 +64,25 @@ ScFormulaReferenceHelper::ScFormulaReferenceHelper(IAnyRefDialog* _pDlg,SfxBindi
 }
 
 ScFormulaReferenceHelper::~ScFormulaReferenceHelper()
+{
+    dispose();
+}
+
+void ScFormulaReferenceHelper::dispose()
 {
     if (bAccInserted)
         Application::RemoveAccel( pAccel.get() );
+    bAccInserted = false;
 
     // common cleanup for ScAnyRefDlg and ScFormulaDlg is done here
-
     HideReference();
     enableInput( true );
 
     ScInputHandler* pInputHdl = SC_MOD()->GetInputHdl();
     if ( pInputHdl )
         pInputHdl->ResetDelayTimer();   // stop the timer for disabling the input line
+
+    pAccel.reset();
 }
 
 void ScFormulaReferenceHelper::enableInput( bool bEnable )
@@ -831,6 +838,7 @@ void ScRefHandler::disposeRefHandler()
     m_rWindow.clear();
     pActiveWin.clear();
     LeaveRefMode();
+    m_aHelper.dispose();
 }
 
 bool ScRefHandler::LeaveRefMode()