Skipping extra Iq evaluation by not calling draw_model function from …

…set polydisperisty parameters routine, ref #624 and #576

src/sas/sasgui/perspectives/fitting/basepage.py

@@ -1037,7 +1037,6 @@ def set_model_state(self, state):
  n = self.disp_box.GetCurrentSelection()
  dispersity = self.disp_box.GetClientData(n)
  name = dispersity.__name__
-
  self._set_dipers_Param(event=None)
 
  if name == "ArrayDispersion":
@@ -2289,7 +2288,11 @@ def _set_dipers_Param(self, event):
  event = PageInfoEvent(page=self)
  wx.PostEvent(self.parent, event)
  #draw the model with the current dispersity
- self._draw_model()
+
+ #Wojtek P, Oct 8, 2016: Calling draw_model seems to be unessecary.
+ #By comenting it we save an extra Iq calculation
+ #self._draw_model()
+
  ## Need to use FitInside again here to replace the next four lines.
  ## Otherwised polydispersity off does not resize the scrollwindow.
  ## PDB Nov 28, 2015