IDLE hangs on OS X with Cocoa Tk if encoding dialog is required during save

[steipe]

BPO	22897
Nosy	@terryjreedy, @ned-deily

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-06-23.07:09:45.737>
created_at = <Date 2014-11-18.19:09:04.367>
labels = ['expert-IDLE', 'type-bug']
title = 'IDLE hangs on OS X with Cocoa Tk if encoding dialog is required during save'
updated_at = <Date 2017-06-23.07:09:45.734>
user = 'https://bugs.python.org/steipe'

bugs.python.org fields:

activity = <Date 2017-06-23.07:09:45.734>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2017-06-23.07:09:45.737>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2014-11-18.19:09:04.367>
creator = 'steipe'
dependencies = []
files = []
hgrepos = []
issue_num = 22897
keywords = []
message_count = 3.0
messages = ['231338', '231353', '296684']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'ned.deily', 'steipe']
pr_nums = []
priority = 'normal'
resolution = 'wont fix'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue22897'
versions = ['Python 2.7']

[steipe]

When attempting to save a file containing an Å character with the debugger open, IDLE freezes with/or without partially opening the warning window. (Mac OS X 10.9.5, IDLE running python 2.7.5). Reproducible steps:

• Create and save file with one line:
  1+1 # A
• Open IDLE
• Open the debugger
• Open the file
• Delete the "A", type <shift><alt>A
• type <command>s to save. This triggers the problem.

Application hangs ("not responding") and needs to force quit. Sometimes the graphics memory of other applications gets corrupted.

[ned-deily]

Thanks for the report. It appears that all that is needed to trigger the hang is any operation that invokes the IDLE EncodingMessage dialog ("Non-ASCII found, yet no encoding declared. Add a line like [...]") in IOBinding.py during a Save when IDLE is linked with the OS X Cocoa Tk 8.5 (or likely 8.6) as used with the python.org 64-bin/32-bit 10.6+ installers, for example, just opening a new edit window, inserting a non-ASCII character, and then trying to Save. EncodingMessage subclasses the Tkinter SimpleDialog module and creates a new Toplevel root; I seem to recall other problems like this in the past. The problem is not seen with the older Carbon Tk 8.4 or with an X11 Tk on OS X.

[terryjreedy]

I am no longer patching IDLE for 2.7