First line and cursor not visible when opening files

[sforman]

BPO	12590
Nosy	@taleinat, @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 = 'https://github.com/ned-deily'
closed_at = <Date 2011-07-27.01:26:46.069>
created_at = <Date 2011-07-20.03:12:21.160>
labels = ['expert-IDLE', 'type-bug']
title = 'First line and cursor not visible when opening files'
updated_at = <Date 2011-07-27.03:06:07.702>
user = 'https://bugs.python.org/sforman'

bugs.python.org fields:

activity = <Date 2011-07-27.03:06:07.702>
actor = 'sforman'
assignee = 'ned.deily'
closed = True
closed_date = <Date 2011-07-27.01:26:46.069>
closer = 'ned.deily'
components = ['IDLE']
creation = <Date 2011-07-20.03:12:21.160>
creator = 'sforman'
dependencies = []
files = []
hgrepos = []
issue_num = 12590
keywords = []
message_count = 4.0
messages = ['140716', '141200', '141201', '141203']
nosy_count = 4.0
nosy_names = ['taleinat', 'ned.deily', 'python-dev', 'sforman']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue12590'
versions = ['Python 2.7', 'Python 3.2', 'Python 3.3']

[sforman]

In IDLE if you open a file that is longer than the editor window the first line, with the cursor, is scrolled off the top of the window making it appear as though the file begins at the second line.

This can be fixed by adding 'text.see("insert")' to the end of the EditorWindow __init__() method, but see Bruce Sherwood's comment on http://bugs.python.org/issue10079#msg118618

[python-dev]

New changeset 73ae3729b8fe by Ned Deily in branch '2.7':
Issue bpo-12590: IDLE editor window now always displays the first line
http://hg.python.org/cpython/rev/73ae3729b8fe

New changeset 1c8aca41845c by Ned Deily in branch '3.2':
Issue bpo-12590: IDLE editor window now always displays the first line
http://hg.python.org/cpython/rev/1c8aca41845c

New changeset b782d7c59f69 by Ned Deily in branch 'default':
Issue bpo-12590: IDLE editor window now always displays the first line
http://hg.python.org/cpython/rev/b782d7c59f69

[ned-deily]

Thanks for the report and the cite.

The problem appears to be a difference in behavior between Tk 8.5 and earlier versions of Tk and not a platform difference. The fix is to use that 'yview' method of Text instead of 'see'. That gives the expected behavior with both Tk 8.5 and 8.4. Fix is applied to 2.7 (for 2.7.3), 3. 2 (for 3.2.2), and default (for 3.3). Only security issues are accepted for Python 2.6 but the patch should apply and work there as well.

[sforman]

You're very welcome.