Docs page's sidebar vibrates on mouse wheel scroll on Chrome.

[BiwinJohn]

BPO	24712
Nosy	@warsaw, @birkenfeld, @pfmoore, @vstinner, @tjguk, @ezio-melotti, @karlcow, @zware, @matrixise, @willingc
PRs	[2.7] bpo-24712: Doc: Make sidebar sticky using browser support. #13179
Files	docs-sidebar.patch: Patch

^{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 = None
closed_at = <Date 2019-05-08.13:39:53.452>
created_at = <Date 2015-07-24.23:19:04.741>
labels = ['type-bug', 'docs']
title = "Docs page's sidebar vibrates on mouse wheel scroll on Chrome."
updated_at = <Date 2019-05-08.13:39:53.451>
user = 'https://bugs.python.org/BiwinJohn'

bugs.python.org fields:

activity = <Date 2019-05-08.13:39:53.451>
actor = 'matrixise'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-05-08.13:39:53.452>
closer = 'matrixise'
components = ['Documentation']
creation = <Date 2015-07-24.23:19:04.741>
creator = 'Biwin John'
dependencies = []
files = ['42917']
hgrepos = []
issue_num = 24712
keywords = ['patch']
message_count = 11.0
messages = ['247303', '247307', '247324', '257768', '258052', '258079', '260123', '265950', '265951', '278003', '341872']
nosy_count = 14.0
nosy_names = ['barry', 'georg.brandl', 'paul.moore', 'vstinner', 'tim.golden', 'ezio.melotti', 'karlcow', 'docs@python', 'zach.ware', 'matrixise', 'willingc', 'Biwin John', 'kats', 'Mike Taylor']
pr_nums = ['13179']
priority = 'low'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue24712'
versions = ['Python 2.7']

[BiwinJohn]

The sidebar on the documentation pages ex. https://docs.python.org/2/library/collections.html vibrates/flashes on mouse wheel scroll.
The sidebar with class sphinxsidebar, works okay when scrolling with the scrollbar, Firefox but not with mouse wheel on Chrome.

please consider fixing it.

[willingc]

Biwan John, thanks for the issue report.

I can confirm that there is jitter due to scroll speed lag in Chrome for Python 2.7 docs. This behavior does not happen with Python 3.x docs. No issues with Firefox.

I am using Mac OS X 10.10 with up-to-date Chrome and Firefox.

I believe that this is likely a Chrome scroll issue and not a Python docs or Sphinx issue.

I have triaged this as "needs patch" in case someone is aware of a workaround to resolve. If this is still open after a month, I would recommend closing the issue as a "third party" issue