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.

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

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.