IDLE: problems with completions on Mac

[rhettinger]

BPO	41611
Nosy	@rhettinger, @terryjreedy, @ronaldoussoren, @vstinner, @taleinat, @ned-deily, @serhiy-storchaka, @miss-islington
PRs	bpo-41611: IDLE: fix freezing on completion on macOS #26400 [3.10] bpo-41611: IDLE: fix freezing on completion on macOS (GH-26400) #26401 [3.9] bpo-41611: IDLE: fix freezing on completion on macOS (GH-26400) #26402 bpo-41611: IDLE: Catch TclError exceptions in AutoCompleteWindow.winconfig_event() #26404 [3.10] bpo-41611: IDLE: Catch TclError exceptions in AutoCompleteWindow.winconfig_event() (GH-26404) #26419 [3.9] bpo-41611: IDLE: Catch TclError exceptions in AutoCompleteWindow.winconfig_event() (GH-26404) #26420

^{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 = 'https://github.com/terryjreedy'
closed_at = <Date 2021-06-12.04:48:58.260>
created_at = <Date 2020-08-21.17:51:37.650>
labels = ['OS-mac', 'expert-IDLE', '3.9', '3.10', '3.11']
title = 'IDLE: problems with completions on Mac'
updated_at = <Date 2021-06-12.04:48:58.260>
user = 'https://github.com/rhettinger'

bugs.python.org fields:

activity = <Date 2021-06-12.04:48:58.260>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2021-06-12.04:48:58.260>
closer = 'terry.reedy'
components = ['IDLE', 'macOS']
creation = <Date 2020-08-21.17:51:37.650>
creator = 'rhettinger'
dependencies = []
files = []
hgrepos = []
issue_num = 41611
keywords = ['patch']
message_count = 21.0
messages = ['375764', '375767', '375768', '375769', '380925', '394508', '394523', '394527', '394528', '394530', '394531', '394543', '394544', '394546', '394587', '394591', '394634', '394635', '394636', '394637', '395676']
nosy_count = 8.0
nosy_names = ['rhettinger', 'terry.reedy', 'ronaldoussoren', 'vstinner', 'taleinat', 'ned.deily', 'serhiy.storchaka', 'miss-islington']
pr_nums = ['26400', '26401', '26402', '26404', '26419', '26420']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41611'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[rhettinger]

In case it is helpful, here is the error log from a recent full-day IDLE session.

$ python3.9 --version
Python 3.9.0rc1
$ python3.9 -m idlelib.idle
Exception in Tkinter callback
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/tkinter/__init__.py", line 1885, in __call__
    return self.func(*args)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/idlelib/autocomplete_w.py", line 248, in winconfig_event
    acw_width, acw_height = acw.winfo_width(), acw.winfo_height()
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/tkinter/__init__.py", line 1291, in winfo_width
    self.tk.call('winfo', 'width', self._w))
_tkinter.TclError: bad window path name ".!listedtoplevel4.!frame.text.!toplevel2"
/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 2 leaked semaphore objects to clean up at shutdown
  warnings.warn('resource_tracker: There appear to be %d '
2020-08-20 15:00:38.074 Python[1512:2706287] WARNING: <NSOpenPanel: 0x7ff5a3ed6280> running implicitly; please run panels using NSSavePanel rather than NSApplication.
2020-08-20 16:29:29.880 Python[1512:2706287] WARNING: <NSOpenPanel: 0x7ff5a25566b0> running implicitly; please run panels using NSSavePanel rather than NSApplication.

[terryjreedy]

The Mac-specific shutdown warning from multiprocessing is not directly related to IDLE. 'multiprocessing' is not imported by IDLE and is not in sys.modules when IDLE starts.

From 'all-day' I assume that there was a time period between starting IDLE and getting the traceback.

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/tkinter/init.py", line 1885, in __call__
return self.func(*args)

__call__ here is a method of CallWrapper, often used for event handlers.

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/idlelib/autocomplete_w.py", line 248, in winconfig_event
acw_width, acw_height = acw.winfo_width(), acw.winfo_height()

winconfig_event handles tk '<configure>' events. "A Configure event is sent to a window whenever its size, position, or border width changes, and sometimes when it has changed position in the stacking order." IDLE triggers it somehow. It has had intermittent bugs before.

File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/tkinter/init.py", line 1291, in winfo_width
self.tk.call('winfo', 'width', self._w))
_tkinter.TclError: bad window path name ".!listedtoplevel4.!frame.text.!toplevel2"

The name is for an editor window (listedtoplevel) with a frame with a text with a popup (unlisted toplevel). The toplevel2 suggests that this is the second popup for this text. The name looks correct except that I expected 'text' to maybe be '!text'. In any case, the name is generated by tkinter without IDLE being involved.

[terryjreedy]

Serhiy, should 'text' be '!text' in a tkinter-generated widget name?

[terryjreedy]

On my Macbook Air Mohave, I don't get completion boxes on either 3.8.3rc1 or 3.9.0rc1, even when clicking Edit => Show completions. Nor does IDLE quit or print anything in Terminal.