Added new tests for Element slice assignments.

Original patch by Silent Ghost.

and running external archivers.

before closing debugger window in IDLE process.

debugger is active (15347); b) closing the debugger with the [X] button
(15348); and c) activating the debugger when already active (24455).
The patch by Mark Roseman does this by making two changes.
1. To suspend and resume the gui.interaction method, use the tcl vwait
mechanism interded for this purpose instead of root.mainloop & .quit.
2. In gui.run, allow any existing interaction to terminate first.

See https://github.com/python/asyncio/pull/295 for details

not to IDLE itself.

This change won't do anything in CPython 3.4

See https://github.com/python/asyncio/pull/293 for details.

Extract of patch by Ronald Oussoren.

See https://github.com/python/asyncio/pull/292 for details.

See https://github.com/python/asyncio/pull/289 for details.

See https://github.com/python/asyncio/pull/291 for details.

Patch by Mark Roseman.

This was triggering intermittent failures in unrelated tests.

not allow the send_signal(), terminate(), or kill() methods to do
anything as they could potentially signal a different process.

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.

This was a regression caused by revision 1da9630e9b7f.  Based on patch by
Eryksun.