[Idle-dev] First line and cursor not visible when opening a file.

[Simon Forman]

On Sun, Jul 17, 2011 at 1:45 PM, Bruce Sherwood <Bruce_Sherwood at ncsu.edu> wrote:
> On Sun, Jul 17, 2011 at 9:33 AM, Tal Einat <taleinat at gmail.com> wrote:
>> On Sun, Jul 17, 2011 at 2:20 AM, Simon Forman <forman.simon at gmail.com> wrote:
>>> On Thu, Jul 14, 2011 at 3:13 PM, Simon Forman <forman.simon at gmail.com> wrote:
>>>> I apologize if this is old news. I searched the Python bug tracker and
>>>> idle-dev list without finding any mention,
>>>>
>>>> I'm using IDLE 2.6.5 on Ubuntu 10.04.
>>>>
>>>> When I open a file that is longer than the edit window the first line
>>>> (containing the cursor) is above the top of the edit window.  Put
>>>> another way, the file opens with the second line at the top of the
>>>> window rather than the first, giving the impression that the file
>>>> starts at the second line, and that the cursor is absent.
>>>>
>>>> I figured I'd ask about it here before filing a bug.
>>>>
>>>> Can anyone shed any light on this behavior?
>>>>
>>>> Warm regards,
>>>> ~Simon
>>>
>>> I took a look in the code but I couldn't figure out where or why this
>>> was happening. I managed to "fix" it by adding the following to the
>>> end of the EditorWindow __init__ method:
>>>
>>>        text.see('insert')
>>>
>>> Is this worth a bug report and patch?
>>
>> Hi Simon,
>>
>> EditorWindow.__init__() already calls io.loadfile() when opening a
>> file, which includes the following near the end:
>>
>> self.text.mark_set("insert", "1.0")
>> self.text.see("insert")
>>
>> However, EditorWindow.__init__() also does a few more things
>> afterwards. The only thing that I can think of right now that would
>> have such an effect is the CodeContext extension, which is loaded by
>> the self.load_extensions() call after io.loadfile(). Could you try
>> disabling this extension (in the config file) and see if this has an
>> effect?
>>
>> - Tal Einat
>
> I think this is one of the many bugs fixed by Guilherme Polo, which
> alas has never made it into the standard release.
>
> Bruce
>

Tal, I commented out my "fix" and set 'enable=0' in the [CodeContext]
section of the config-extensions.def file but the behavior still
occurs.

Looking over http://bugs.python.org/issue10079 I see your comment,
Bruce, to the effect that a line in IOBinding.py causes the bug.

Can anyone give me some guidance as to if and how I could help this
fix get in to the standard release?

Having used IDLE professionally as my only IDE for Python for nearly
eight years I'd be delighted if I could give back some effort. :)

Warm regards,
~Simon

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