IDLE: Remove annoying line in Shell sidebar

[antudic]

BPO	47242
Nosy	@terryjreedy, @antudic

^{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 = None
created_at = <Date 2022-04-06.16:20:04.905>
labels = ['expert-IDLE', 'type-bug', '3.10']
title = 'Annoying white bar in IDLE (line 457 in sidebar.py)'
updated_at = <Date 2022-04-06.16:20:04.905>
user = 'https://github.com/antudic'

bugs.python.org fields:

activity = <Date 2022-04-06.16:20:04.905>
actor = 'antudic'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2022-04-06.16:20:04.905>
creator = 'antudic'
dependencies = []
files = []
hgrepos = []
issue_num = 47242
keywords = []
message_count = 1.0
messages = ['416883']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'antudic']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47242'
versions = ['Python 3.10']

Linked PRs

• gh-91398: Remove IDLE shell sidebar padding #32363

[antudic]

I noticed there was a white bar to the left in my IDLE when I upgraded to 3.10, it stuck out like a soar thumb since I have a custom dark theme. This was not an issue with earlier versions. After scouring through the code I found the perpetrator to be a "padx=2" in sidebar.py on line 457. Changing this value from "2" to "0" fixes this issue.

Changing this line of code solves this issue and leaves the color choices up to the user, as intended.