[issue31974] Cursor misbahavior with Tkinter 3.6.1/tk 8.5 Text on Mac Sierra

[Ned Deily]

Ned Deily  added the comment:

Update: for Python 3.6.5 and 3.7.0, there are new python.org 10.9+ installer 
variants that come with a built-in Tcl/Tk 8.6.8.  They are currently both 
available in testing pre-releases (3.6.5rc1 and 3.7.0b2):

https://www.python.org/download/pre-releases/

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[issue31974] Cursor misbahavior with Tkinter 3.6.1/tk 8.5 Text on Mac Sierra

[Terry J. Reedy]

Terry J. Reedy  added the comment:

3.7.0a2 is out now.  There will be an .0a3, .0a4, then .0b1 in January.  Ned is 
saying that at least the last of these will be compiled to work with 8.6.  Once 
that occurs, I would switch as most of the remaining changes before the .0 
release will be fixes to new features, which you can not use.  With respect to 
existing features, 3.7 should be as good as 3.6 as 3.7 has all of the bugfixes 
in 3.6 plus some that will only appear in the future 3.6.4 release.

Irv, when you reply by email, please delete the quoted previous message (except 
perhaps for a phrase being specifically addressed).

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[issue31974] Cursor misbahavior with Tkinter 3.6.1/tk 8.5 Text on Mac Sierra

[Irv Kalb]

Irv Kalb  added the comment:

Hi Ned,

Thanks for your message.  But I want to make sure I understand what you are 
saying here.  

I am using absolutely vanilla Python 3.6 from python.org , 
but have upgraded to version 8.5.18  if ActiveState tk.  I was told that this 
version of Python would not work correctly with the current (8.6) version of 
tk.  So, I have not installed that.

Am I correct in understanding that this but is not fixable when using Python 
3.6?  (That's OK, I just want to make sure.)

It sounds like when Python 3.7 comes out, if I still see the bug, I could 
upgrade to ActiveState 8.6.7, and that combination should fix the problem.  Is 
that correct?

Thanks again,

Irv

> On Nov 10, 2017, at 7:00 AM, Ned Deily  wrote:
> 
> 
> Ned Deily  added the comment:
> 
> Thanks for the very helpful video, Irv.  It is definitely not a Python issue 
> as I am able to reproduce the positioning problem using the current 
> ActiveState Community Edition 8.6.6 and 8.5.18 macOS Wish shell text widget 
> demos (as long as I use spaces at the beginning of a line and not tabs).  
> However, the current MacPorts Tk which has been updated to 8.6.7 does not 
> seem to have this problem, so, if it was fixed in Tk, it was fixed fairly 
> recently.  The python.org 3.7 for macOS will use 8.6 by default prior to 
> feature code off.
> 
> --
> resolution:  -> third party
> stage:  -> resolved
> status: open -> closed
> 
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[issue31974] Cursor misbahavior with Tkinter 3.6.1/tk 8.5 Text on Mac Sierra

[Ned Deily]

Ned Deily  added the comment:

Thanks for the very helpful video, Irv.  It is definitely not a Python issue as 
I am able to reproduce the positioning problem using the current ActiveState 
Community Edition 8.6.6 and 8.5.18 macOS Wish shell text widget demos (as long 
as I use spaces at the beginning of a line and not tabs).  However, the current 
MacPorts Tk which has been updated to 8.6.7 does not seem to have this problem, 
so, if it was fixed in Tk, it was fixed fairly recently.  The python.org 3.7 
for macOS will use 8.6 by default prior to feature code off.

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resolution:  -> third party
stage:  -> resolved
status: open -> closed

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[issue31974] Cursor misbahavior with Tkinter 3.6.1/tk 8.5 Text on Mac Sierra

[Terry J. Reedy]

New submission from Terry J. Reedy :

MacOS Sierra 10.12.6, Python 3.6.1, tk 8.5.15 or .18.  Consider this code with 
arbitrary compound statements and therefore indented lines.

for i in range(10):
if i%2:
print(f(i))

Irv Kalb on idle-dev thread 'Bug in cursor placement in IDLE editor' windows 
reports the following obnoxious behavior: click just to left or on left side of 
'p' and cursor appears on left margin.  Keep clicking and cursor moves right 
one space at a time until arriving next to 'p', where it should immediately go, 
and does on Windows, and, I presume, elsewhere.  (When the cursor first arrives 
at 'p', there is also the double-click selection highlight.)

At my suggestion, he also tested with code inserted directly in a tk Test 
window with this:

import tkinter as tk
root = tk.Tk()
text = tk.Text(root)
sample = '''

'''
text.insert('1.0', sample)
text.pack()
root.mainloop()

and encountered the same bug.  (Hence, this is not an IDLE issue.)The only 
difference is that clicking beside keyword 'if' does not show bug in IDLE but 
does in Text.  He also uploaded an unlisted video to YouTube.
https://www.youtube.com/watch?v=Us8px0BY5rg

Irv's current workaround is to click a letter or two to the right and use <-- 
key.

I realize that this is likely not a tkinter issue either, but I wanted to 
record it and get you two's thoughts.  Is this more likely to be a problem with 
a particular installation, or with at least one macOS release and even 8.5.18.

If the latter, can Irv install Python compiled elsewhere to work with 8.6?  
Ned, do you have a recommendation?

Kevin Walzer reported that he does not see the issue with Python built to run 
with 8.6 and using 8.6.7.  He noted that 8.5.18 does not get bug fixes.  I 
presume that this applies to 8.5 in general.  Will 3.7.0 be compiled for 8.6?

--
messages: 305800
nosy: IrvKalb, ned.deily, serhiy.storchaka, terry.reedy
priority: normal
severity: normal
status: open
title: Cursor misbahavior with Tkinter 3.6.1/tk 8.5 Text on Mac Sierra
type: behavior
versions: Python 3.6, Python 3.7

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