tdf#113026: disable mpBoxLegend when legend not visible

Change-Id: Idc297808e1d95aecfd42e91a2aa7b99523ac7fb8
Reviewed-on: https://gerrit.libreoffice.org/43924Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
Tested-by: Xisco Faulí <xiscofauli@libreoffice.org>

chart2/source/controller/sidebar/ChartElementsPanel.cxx

@@ -416,6 +416,7 @@ void ChartElementsPanel::updateData()
     SolarMutexGuard aGuard;
 
     mpCBLegend->Check(isLegendVisible(mxModel));
+    mpBoxLegend->Enable( isLegendVisible(mxModel) );
     mpCBTitle->Check(isTitleVisisble(mxModel, TitleHelper::MAIN_TITLE));
     mpCBSubtitle->Check(isTitleVisisble(mxModel, TitleHelper::SUB_TITLE));
     mpCBXAxisTitle->Check(isTitleVisisble(mxModel, TitleHelper::X_AXIS_TITLE));