with a null byte.

Previously it was called another time via hasattr(), and both calls were
made once for dir(f) and again for dir(f.__class__).  This includes a
backport of changing from a list to a set from revision 4dbb315fe667.

address the compatibility problem introduced by the addition of IDLE Dark.
Consistently use the revised idleConf.CurrentTheme everywhere in idlelib.

parse command line arguments.

Reported by Hrvoje Abraham on docs@.

rejects builtin types with not defined __new__.

Patch started by Stéphane Wirtel.

It now has slightly better rationale and a less awkward wording in the
explanation.

Inspired by a report of a neither/or conflict by 'animalize' on docs@.

link counting for directories.

Use time.time instead of time.clock.

failure when the test is ran the second time.

The root attribute was set in parent class in setUpClass and then
overridded in child class in tearDownClass.

in range(0, 256).

whitespace is a substring of smallest leading whitespace.
Based on patch by Robert Li.

Clarify message and expected action for beginners.