Last modified: 2012-05-01 02:17:16 UTC

Wikimedia Bugzilla is closed!

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Bug 36308 - Top bar not following during scrolling


Summary:	Top bar not following during scrolling

Status:	RESOLVED FIXED

Product:	MediaWiki extensions
Classification:	Unclassified
Component:	PageCuration (Other open bugs)
Version:	unspecified
Hardware:	PC Windows 7

Importance:	Unprioritized normal (vote)
Target Milestone:	---
Assigned To:	Nobody - You can work on this!

URL:
Whiteboard:
Keywords:

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2012-04-27 19:57 UTC by Oliver Keyes
Modified:	2012-05-01 02:17 UTC (History)
CC List:	2 users (show)

See Also:
Web browser:	Firefox
Mobile Platform:	---
Assignee Huggle Beta Tester:	---

Attachments
Screenshot (178.73 KB, image/png) 2012-04-27 19:57 UTC, Oliver Keyes	Details
Add an attachment (proposed patch, testcase, etc.)

Description Oliver Keyes 2012-04-27 19:57:19 UTC

Created attachment 10480 [details]
Screenshot

See the screenshot. It's a very, very precise bug; if I scroll after loading the page fresh, the top bar follows nicely. If I then go all the way to the top of the page again, *then* scroll, it fails to follow. Go to the top again, scroll again, it does. It quite literally appears 50 percent of the time ;p

Comment 1 Ryan Kaldari 2012-04-27 20:01:36 UTC

I can reproduce this every once in a while in Firefox. It does seem to have something to do with returning to the very top of the page after scrolling.

Comment 2 Ryan Kaldari 2012-05-01 00:14:05 UTC

This bug is very frustrating. Apparently, every once in a while...

$( '#mwe-pt-list-control-nav' ).parent().addClass('stickyTop');

just fails silently. No idea why.

Comment 3 Ryan Kaldari 2012-05-01 00:28:34 UTC

Seems to be a Firefox bug. If I activate the Javascript debugger in Firefox, it works without fail, but if the debugger is turned off, it's unreliable. Probably related to Firefox's weird JS thread handling.

Comment 4 Ryan Kaldari 2012-05-01 02:17:07 UTC

Tracked it down to a concurrency problem. Fixed in https://gerrit.wikimedia.org/r/#change,6221 by reworking the top waypoint function and adding some sanity checks.

Wikimedia Bugzilla is closed!

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