[issue16023] IDLE freezes on ^5 or ^6 (Un-)Tabify Region with OS X Cocoa Tk 8.5

[Ned Deily]

Ned Deily added the comment:

I can no longer reproduce this either so I agree with Mark that it has most 
likely been fixed in later versions of Tk.  If the problem can be reproduced 
with current Tk releases, please re-open.

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resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue16023] IDLE freezes on ^5 or ^6 (Un-)Tabify Region with OS X Cocoa Tk 8.5

[Terry J. Reedy]

Terry J. Reedy added the comment:

Is this still current?  Mark, any ideas on a fix for this one?

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nosy: +markroseman, terry.reedy

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[issue16023] IDLE freezes on ^5 or ^6 (Un-)Tabify Region with OS X Cocoa Tk 8.5

[Mark Roseman]

Mark Roseman added the comment:

Just tried and it seemed to work ok for me. I'm guessing it'll be a particular 
Tk version. Noting the timeline on the original bug report and subsequent 
comments, that was right when Tk 8.5 switched from Carbon to Cocoa, so it was 
probably something that got shaken out in later versions.

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[issue16023] IDLE freezes on ^5 or ^6 (Un-)Tabify Region with OS X Cocoa Tk 8.5

[Terry J. Reedy]

Changes by Terry J. Reedy tjre...@udel.edu:


--
versions: +Python 3.4, Python 3.5 -Python 3.2, Python 3.3

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[issue16023] IDLE freezes on ^5 or ^6 (Un-)Tabify Region with OS X Cocoa Tk 8.5

[Ronald Oussoren]

Ronald Oussoren added the comment:

Interestingly enough it seems to hang while handling an import error, when  I 
break executation and look at the stack trace I see (amongst others):


#5  0x0001000b11f1 in import_all_from [inlined] () at 
/Users/ronald/Projects/python/rw/default/Python/ceval.c:4614
4614PyErr_SetString(PyExc_ImportError,
(gdb) l
4609PyErr_Clear();
4610dict = _PyObject_GetAttrId(v, PyId___dict__);
4611if (dict == NULL) {
4612if (!PyErr_ExceptionMatches(PyExc_AttributeError))
4613return -1;
4614PyErr_SetString(PyExc_ImportError,
4615from-import-* object has no __dict__ and no __all__);
4616return -1;
4617}
4618all = PyMapping_Keys(dict);
(gdb) 


This is with an optimized build, the debugger isn't as useful as I'd like and 
some information seem suspect (such as a frame object with an obviously invalid 
value for f_code.

This is probably a red herring, I haven't been able to reproduce this 
particular problem with a debug build.

In the production build I got a (non-functional) popup for entering some 
information, in the debug build I don't even get that and the proces hangs in 
CFRunLoopRunSpecific (called by Tk). And that's due to a call to tkwait window 
... (aka the wait_window method from tkinter.Misc).

Debugging is slightly annoying because 'pyo' from the gdb macros works, but the 
printing a python stack trace does not.

The call is eventually traceable to calling simpledialog.askinteger in 
EditorWindow.tabify_region_event (through _asktabwidth) and is likely a bug 
where TkCocoa doesn't like callbacks into Tk from an event handler (IIRC we've 
had those before)

A quick hack to test this theorie is to redefine tabify_region_event:

def tabify_region_event(self, event):
self.after(200, lambda: self._tabify_region_event(event))

def _tabify_region_event(self, event):
# original method


This doesn't actually help, IDLE still hangs and my theory is likely wrong.

The easiest workaround is likely to give up for now and disable the ^5 and ^6 
shortcuts (as well as ^3 and ^4 as those don't crash but don't do anything 
either, while the menu entries do work).

Annoyingly other commands in the format menu work just fine (CTRL-T, CMD-], 
CMD-[)



(all of this with the tip of the default branch and a freshly installed copy of 
ActiveTcl 8.5 on OSX 10.8)

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[issue16023] IDLE freezes on ^5 or ^6 (Un-)Tabify Region with OS X Cocoa Tk 8.5

[Ned Deily]

Ned Deily added the comment:

Thanks for the additional information!  I can now reproduce a hang using just 
Ctrl-5 on a US keyboard input method.  Ctrl-5 is the default IDLE keyboard 
accelerator for the Tabify Region menu item under the Format menu cascade 
for an edit window.  With any current Python (2.7.3, 3.2.3, or 3.3.0rc3) linked 
with Cocoa Tk 8.5, using the Ctrl-5 accelerator key causes the hang, requiring 
a force quit.  Selecting the menu item with a mouse causes the Tab Width 
window to appear as expected.  Ctrl-5 seems to work properly with Pythons 
linked with either Carbon Tk 8.4 or with X11 8.5.  There is a similar hang 
behavior with Ctrl-6 Untabify Region using Cocoa Tk 8.5 as well.  Attached is 
an excerpt from a hang dump when running with a debug framework build of 3.3 
tip.

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nosy: +ned.deily
title: IDLE froze when typing ctrl-shift-5 - IDLE freezes on ^5 or ^6 
(Un-)Tabify Region with OS X Cocoa Tk 8.5
versions: +Python 2.7, Python 3.3
Added file: http://bugs.python.org/file27308/3.3.0_tip_10_8_2012-09-25.hang

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