Only emit the signal when the data has changed

Refs #11377

Code/Mantid/MantidQt/MantidWidgets/src/DataSelector.cpp

@@ -24,7 +24,7 @@ namespace MantidQt
       connect(m_uiForm.pbLoadFile, SIGNAL(clicked()), this, SIGNAL(loadClicked()));
 
       //data selected changes
-      connect(m_uiForm.rfFileInput, SIGNAL(filesFound()), this, SLOT(handleFileInput()));
+      connect(m_uiForm.rfFileInput, SIGNAL(filesFoundChanged()), this, SLOT(handleFileInput()));
       connect(m_uiForm.wsWorkspaceInput, SIGNAL(currentIndexChanged(int)), this, SLOT(handleWorkspaceInput()));
       connect(m_uiForm.pbLoadFile, SIGNAL(clicked()), this, SLOT(handleFileInput()));
 
@@ -66,7 +66,7 @@ namespace MantidQt
     /**
      * Get if the file selector is currently being shown.
      *
-     * @return :: true if it is visible, otherwise false 
+     * @return :: true if it is visible, otherwise false
      */
     bool DataSelector::isFileSelectorVisible() const
     {
@@ -77,7 +77,7 @@ namespace MantidQt
     /**
      * Get if the workspace selector is currently being shown.
      *
-     * @return :: true if it is visible, otherwise false 
+     * @return :: true if it is visible, otherwise false
      */
     bool DataSelector::isWorkspaceSelectorVisible() const
     {
@@ -107,7 +107,7 @@ namespace MantidQt
         if(isValid && m_autoLoad)
         {
           const QString wsName = getCurrentDataName();
-          
+
           if(!AnalysisDataService::Instance().doesExist(wsName.toStdString()))
           {
             //attempt to reload if we can
@@ -118,9 +118,9 @@ namespace MantidQt
             loadAlg->setProperty("Filename", filepath.toStdString());
             loadAlg->setProperty("OutputWorkspace", wsName.toStdString());
             loadAlg->execute();
-            
+
             isValid = AnalysisDataService::Instance().doesExist(wsName.toStdString());
-            
+
             if(!isValid)
             {
               m_uiForm.rfFileInput->setFileProblem("The specified workspace is missing from the analysis data service");
@@ -448,18 +448,18 @@ namespace MantidQt
      */
     void DataSelector::dropEvent(QDropEvent *de)
     {
-      const QMimeData *mimeData = de->mimeData();  
+      const QMimeData *mimeData = de->mimeData();
       auto before_action = de->dropAction();
 
       if (de->mimeData() && mimeData->text().contains(" = mtd[\"")){
         m_uiForm.wsWorkspaceInput->dropEvent(de);
-        if (de->dropAction() == before_action){    
+        if (de->dropAction() == before_action){
           m_uiForm.cbInputType->setCurrentIndex(1);
           return;
         }
-        de->setDropAction(before_action);    
+        de->setDropAction(before_action);
       }
-  
+
       m_uiForm.rfFileInput->dropEvent(de);
       if (de->dropAction() == before_action){
         m_uiForm.cbInputType->setCurrentIndex(0);