fix for python2.2 -Qnew division error,

thanks Tim!

Lib/idlelib/AutoIndent.py

@@ -462,7 +462,7 @@ def classifyws(s, tabwidth):
             effective = effective + 1
         elif ch == '\t':
             raw = raw + 1
-            effective = (effective / tabwidth + 1) * tabwidth
+            effective = (int(effective / tabwidth) + 1) * tabwidth
         else:
             break
     return raw, effective