updateRecentFiles when loading new files removed from here, re #10335

also improved some error messages

Code/Mantid/MantidPlot/src/ApplicationWindow.cpp

@@ -4474,15 +4474,14 @@ void ApplicationWindow::openRecentFile(int index)
   if (!f.exists()){
     QMessageBox::critical(this, tr("MantidPlot - File Open Error"),//Mantid
                           tr("The file: <b> %1 </b> <p>does not exist anymore!"
-                             "<p>It will be removed from the list.").arg(fn));
+                             "<p>It will be removed from the list of recent files.").arg(fn));
 
     recentFiles.remove(fn);
-    updateRecentFilesList(fn);
+    updateRecentFilesList();
     return;
   }
 
   loadDataFileByName(fn);
-  updateRecentFilesList(fn);
   saveSettings();   // save new list of recent files
 }
 
@@ -4496,7 +4495,7 @@ void ApplicationWindow::openRecentProject(int index)
   if (!f.exists()){
     QMessageBox::critical(this, tr("MantidPlot - File Open Error"),//Mantid
         tr("The file: <b> %1 </b> <p>does not exist anymore!"
-            "<p>It will be removed from the list.").arg(fn));
+            "<p>It will be removed from the list of recent projects.").arg(fn));
 
     recentProjects.remove(fn);
     updateRecentProjectsList();
@@ -6257,7 +6256,6 @@ void ApplicationWindow::loadDataFile()
   if(fn != "") {
     loadDataFileByName(fn);
   }
-  updateRecentFilesList(fn);
   saveSettings();   // save new list of recent files
 }