Looking at history:
2014-05-02:
    reportdesign: sal_Bool->bool
e23c98d7

2008-06-16:
    INTEGRATION: CWS rptchart02 (1.7.4); FILE MERGED
    2008/05/16 12:53:21 oj 1.7.4.6: #i89365# copy props before set args at chart
    2008/05/07 06:56:32 oj 1.7.4.5: #i88842# set databaseprovider at chart
    2008/04/30 13:03:34 oj 1.7.4.4: #i88843# impl clone method
    2008/04/16 06:28:15 oj 1.7.4.3: RESYNC: (1.7-1.8); FILE MERGED
    2008/04/03 06:35:18 oj 1.7.4.2: #i86343# remove unused code
    2008/03/12 09:45:16 oj 1.7.4.1: impl chart handling
b8fe847a
@@ -299,10 +297,9 @@ void OObjectBase::EndListening(sal_Bool /*bRemoveListener*/)
     DBG_CHKTHIS( rpt_OObjectBase,NULL);
     OSL_ENSURE(!m_xReportComponent.is() || isListening(), "OUnoObject::EndListening: not listening currently!");

+    m_bIsListening = sal_False;
     if ( isListening() && m_xReportComponent.is() )
     {
-        m_bIsListening = sal_False;
-
         // XPropertyChangeListener
         if ( m_xPropertyChangeListener.is() )
         {
Since isListening() returns the value of m_bIsListening
(see https://opengrok.libreoffice.org/xref/core/reportdesign/inc/RptObject.hxx#79)
quite suspicious.

We may think that "m_bIsListening = false;" should be put if we succeed in removing the listener
382      if ( isListening() && m_xReportComponent.is() )
383      {
384          // XPropertyChangeListener
385          if ( m_xPropertyChangeListener.is() )
386          {
387              // remove listener
388              try
389              {
390                  m_xReportComponent->removePropertyChangeListener( OUString() , m_xPropertyChangeListener );
391              }
392              catch(const uno::Exception &)
393              {
394                  OSL_FAIL("OObjectBase::EndListening: Exception caught!");
395              }
396          }
397          m_xPropertyChangeListener.clear();
398      }
Either in the try after the remove or in a finally if we don't want to care about catch part.
(see https://opengrok.libreoffice.org/xref/core/reportdesign/source/core/sdr/RptObject.cxx#377)
But considering the 2008 commit and the former state before it, it seems it was on purpose to put m_bIsListening in all cases so...

Change-Id: I7db8ba45d915e28e707cea61d16ef94fc13b969a
Reviewed-on: https://gerrit.libreoffice.org/56898
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>