Refs #11814 Correct the display of the rec. depth in plugin

Code/Mantid/Vates/VatesSimpleGui/ViewWidgets/inc/MantidVatesSimpleGuiViewWidgets/ViewBase.h

@@ -243,6 +243,8 @@ public slots:
   pqPipelineRepresentation *getRep();
   /// Collect time information for animation controls.
   void handleTimeInfo(vtkSMDoubleVectorProperty *dvp);
+  /// Set the recursion depth
+  void setRecursionDepthForTopLevelSplitting(pqPipelineSource* source, QString wsName);
 
   ColorUpdater colorUpdater; ///< Handle to the color updating delegator
   BackgroundRgbProvider backgroundRgbProvider; /// < Holds the manager for background color related tasks.

Code/Mantid/Vates/VatesSimpleGui/ViewWidgets/src/ViewBase.cpp

@@ -1,7 +1,8 @@
 #include "MantidVatesSimpleGuiViewWidgets/ViewBase.h"
 #include "MantidVatesSimpleGuiViewWidgets/BackgroundRgbProvider.h"
 #include "MantidVatesSimpleGuiViewWidgets/RebinnedSourcesManager.h"
-
+#include "MantidVatesAPI/ADSWorkspaceProvider.h"
+#include "MantidAPI/IMDEventWorkspace.h"
 #if defined(__INTEL_COMPILER)
   #pragma warning disable 1170
 #endif
@@ -292,6 +293,13 @@ pqPipelineSource* ViewBase::setPluginSource(QString pluginName, QString wsName)
   vtkSMPropertyHelper(src->getProxy(),
                       "Mantid Workspace Name").Set(wsName.toStdString().c_str());
 
+  // WORKAROUND BEGIN 
+  // We are setting the recursion depth to 1 when we are dealing with MDEvent workspaces
+  // with top level splitting, but this is not updated in the plugin line edit field. 
+  // We do this here.
+  setRecursionDepthForTopLevelSplitting(src, wsName);
+  // WORKAROUND END
+
   // Update the source so that it retrieves the data from the Mantid workspace
   src->getProxy()->UpdateVTKObjects(); // Updates all the proxies
   src->updatePipeline(); // Updates the pipeline
@@ -898,7 +906,27 @@ void ViewBase::removeVisibilityListener() {
   }
 }
 
-
+/**
+ * Set the recursion depth to 1 when we are dealing with a workspace with top level splitting.
+ * This is a workaround. The recusion depth is set in the plugin which loads the source. 
+ * But this does not udpate the line edit field in the VSI. We therefore need to change this here.
+ * Note that this is only a cosmetic change and will not cause the source to reload, as the 
+ * recursion depth in the plugin is already set to 1.
+ * @param source :: the newly created source
+ * @param wsName :: the name of the workspace corresponding to the source
+ */
+void ViewBase::setRecursionDepthForTopLevelSplitting(pqPipelineSource* source, QString wsName){
+  Mantid::VATES::ADSWorkspaceProvider<Mantid::API::IMDEventWorkspace> workspaceProvider;
+  auto workspace = boost::dynamic_pointer_cast<Mantid::API::IMDEventWorkspace>(workspaceProvider.fetchWorkspace(wsName.toStdString()));
+  if (workspace) {
+    auto boxController = workspace->getBoxController();
+    boost::optional<std::vector<size_t>> topLevelSplits = boxController->getSplitTopInto();
+    if (topLevelSplits) {
+      vtkSMPropertyHelper(source->getProxy(),
+                      "Recursion Depth").Set(1);
+    }
+  }
+}
 
 } // namespace SimpleGui
 } // namespace Vates