Don't cache (TEXT, Markup) events in serializers. This is not needed and since Markup instances compare equal to the same non-Markup string this can lead to incorrect cached output being retrieved. Fixes #429. This is patch t429-fix.2.patch from that ticket. It includes an additional unrelated test to check that the WhitespaceFilter actually removes ignorable whitespace.

exclude doc/2000ft.graffle
recursive-exclude doc/logo.lineform *
include doc/api/*.*
include doc/*.html
recursive-include genshi/template/tests/templates *.html *.txt