Message 148864 - Python tracker

I attached a better patch that preserves the goals of the original code while not creating two color delegators.

I traced down when the regression occurred (2007-09-06):
(a4bd8a4805a8) 1. Fail gracefully if the file fails to decode when loaded.

This patch (2008-02-16) modified parts of the last patch, as well adds "ResetColorizer" to the filename_change_hook.
(7c4c46342137) Merged revisions 60481,60485,60489-60492,60494-60496,60498-60499,60501-60503,605