Corrected completion with scintilla:

if user had "a=xxx" and try to complete xxx than a= was removed.
Related to bug  #270558

IPython/gui/wx/ipython_view.py

@@ -412,7 +412,7 b' class WxConsoleView(stc.StyledTextCtrl):'
             self.AutoCompSetIgnoreCase(False)
             self.AutoCompSetAutoHide(False)
             #let compute the length ot last word
-            splitter = [' ', '(', '[', '{']
+            splitter = [' ', '(', '[', '{','=']
             last_word = self.getCurrentLine()
             for breaker in splitter:
                 last_word = last_word.split(breaker)[-1]