templatefilters: add "nonempty" template filter
It ensures that at least "(none)" is returned in case the argument
passed is None or ''. This is primarily useful to render empty
changelog messages for hgweb but may be useful for others, too.
keepalive: fix
4f13ed6ee544, reintroduce unredirected_hdrs
The previous fix dropped unredirected_hdrs which contain authentication
headers. Removing them break POST request requiring authentication (like
unbundle calls to bitbucket.org).
hgweb: pre-init mimetypes module (fixes ugly bug in python-2.6.2 mimetypes)
The ugly initialization hack in mimetypes' initialization procedure can make
hg serve hit the maximum recursion depth when in threaded mode.
ui: ui.copy() now takes the ui class into account
Helps subclassing by other API users.