When reading a continuation line, make sure we still use the transformed

name when filling in the internal data structures, otherwise we incorrectly
raise a KeyError.

This fixes SF bug #432369.

Lib/ConfigParser.py

@@ -431,7 +431,8 @@ class ConfigParser:
             if line[0] in ' \t' and cursect is not None and optname:
                 value = line.strip()
                 if value:
-                    cursect[optname] = cursect[optname] + '\n ' + value
+                    k = self.optionxform(optname)
+                    cursect[k] = "%s\n%s" % (cursect[k], value)
             # a section header or option header?
             else:
                 # is it a section header?