From 3490ff34e827c9b33626099d2bd3c62fe93833a8 Mon Sep 17 00:00:00 2001
From: Dan Nixon <dan@dan-nixon.com>
Date: Fri, 10 Oct 2014 10:48:15 +0100
Subject: [PATCH] Only replot when new filename has been entered

Refs #10299
---
 .../MantidQtCustomInterfaces/IndirectDiagnostics.h    |  3 +++
 .../CustomInterfaces/src/IndirectDiagnostics.cpp      | 11 +++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/IndirectDiagnostics.h b/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/IndirectDiagnostics.h
index 70397b816db5..53ad5f130fd9 100644
--- a/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/IndirectDiagnostics.h
+++ b/Code/Mantid/MantidQt/CustomInterfaces/inc/MantidQtCustomInterfaces/IndirectDiagnostics.h
@@ -75,6 +75,9 @@ namespace CustomInterfaces
     void updatePreviewPlot();
     void sliceAlgDone(bool error);
 
+  private:
+    QString m_lastDiagFilename;
+
   };
 } // namespace CustomInterfaces
 } // namespace Mantid
diff --git a/Code/Mantid/MantidQt/CustomInterfaces/src/IndirectDiagnostics.cpp b/Code/Mantid/MantidQt/CustomInterfaces/src/IndirectDiagnostics.cpp
index 169b2b85be68..07ca6f698d15 100644
--- a/Code/Mantid/MantidQt/CustomInterfaces/src/IndirectDiagnostics.cpp
+++ b/Code/Mantid/MantidQt/CustomInterfaces/src/IndirectDiagnostics.cpp
@@ -21,7 +21,7 @@ namespace CustomInterfaces
   /** Constructor
    */
   IndirectDiagnostics::IndirectDiagnostics(Ui::IndirectDataReduction& uiForm, QWidget * parent) :
-      IndirectDataReductionTab(uiForm, parent)
+      IndirectDataReductionTab(uiForm, parent), m_lastDiagFilename("")
   {
     // Property Tree
     m_propTrees["SlicePropTree"] = new QtTreePropertyBrowser();
@@ -227,6 +227,14 @@ namespace CustomInterfaces
    */
   void IndirectDiagnostics::slicePlotRaw()
   {
+    QString filename = m_uiForm.slice_inputFile->getFirstFilename();
+
+    // Only update if we have a different file
+    if(filename == m_lastDiagFilename)
+      return;
+
+    m_lastDiagFilename = filename;
+
     disconnect(m_dblManager, SIGNAL(valueChanged(QtProperty*, double)), this, SLOT(updatePreviewPlot()));
     disconnect(m_blnManager, SIGNAL(valueChanged(QtProperty*, bool)), this, SLOT(updatePreviewPlot()));
 
@@ -234,7 +242,6 @@ namespace CustomInterfaces
 
     if ( m_uiForm.slice_inputFile->isValid() )
     {
-      QString filename = m_uiForm.slice_inputFile->getFirstFilename();
       QFileInfo fi(filename);
       QString wsname = fi.baseName();