Added a fix to plot correctly on single fits Re #28077

This is a quick fix to to replace the fact that previously the fits were always updated using the zero table index. In the longer term there is a lot of tidying up to be done in the multi-input code.

qt/scientific_interfaces/Indirect/IndirectFitAnalysisTab.cpp

@@ -368,11 +368,11 @@ void IndirectFitAnalysisTab::updateSingleFitOutput(bool error) {
 
   if (error) {
     m_fittingModel->cleanFailedSingleRun(m_fittingAlgorithm,
-                                         TableDatasetIndex{0});
+                                         m_currentTableDatasetIndex);
     m_fittingAlgorithm.reset();
   } else
     m_fittingModel->addSingleFitOutput(m_fittingAlgorithm,
-                                       TableDatasetIndex{0});
+                                       m_currentTableDatasetIndex);
 }
 
 /**
@@ -530,6 +530,7 @@ void IndirectFitAnalysisTab::singleFit(TableDatasetIndex dataIndex,
     enableFitButtons(false);
     enableOutputOptions(false);
     m_fittingModel->setFittingMode(FittingMode::SIMULTANEOUS);
+    m_currentTableDatasetIndex = dataIndex;
     runSingleFit(m_fittingModel->getSingleFit(dataIndex, spectrum));
   }
 }

qt/scientific_interfaces/Indirect/IndirectFitAnalysisTab.h

@@ -161,6 +161,7 @@ private:
   std::unique_ptr<IndirectFitOutputOptionsPresenter> m_outOptionsPresenter;
   IndirectFitPropertyBrowser *m_fitPropertyBrowser{nullptr};
   Mantid::API::IAlgorithm_sptr m_fittingAlgorithm;
+  TableDatasetIndex m_currentTableDatasetIndex;
 };
 
 } // namespace IDA