re #8505: Preserve information of movements from event workspace

The conjoinworkspace does not copy the parameters, this means, that the
centralization of the workspace would be lost. To avoid this, the
method now copies the instrument parameters

Code/Mantid/scripts/SANS/SANSUtility.py

@@ -438,14 +438,24 @@ def getMonitor4event(ws_event):
     return ws_monitor
 
 def fromEvent2Histogram(ws_event, ws_monitor = None):
+    """Transform an event mode workspace into a histogram workspace. 
+    It does conjoin the monitor and the workspace as it is expected from the current 
+    SANS data inside ISIS. 
+
+    Finally, it copies the parameter map from the workspace to the resulting histogram
+    in order to preserve the positions of the detectors components inside the workspace. 
+    
+    It will finally, replace the input workspace with the histogram equivalent workspace.
+    """
     if not ws_monitor:
         ws_monitor = getMonitor4event(ws_event)
 
     aux_hist = RebinToWorkspace(ws_event, ws_monitor, False)
 
     name = '__monitor_tmp'
     ws_monitor.clone(OutputWorkspace=name)
-    ConjoinWorkspaces(name, aux_hist, CheckOverlapping=True)
+    ConjoinWorkspaces(name, aux_hist, CheckOverlapping=True)    
+    CopyInstrumentParameters(ws_event, OutputWorkspace=name)
 
     ws_hist = RenameWorkspace(name, OutputWorkspace=str(ws_event))