1157264 - Hysteresis in scroll wheel handling causes viewport to shift

Status: RESOLVED FIXED

(Core :: Panning and Zooming, defect)

Description

[Jim Mathies [:jimm]]

STR:

1) open http://www.techmeme.com/
2) let the page load
3) scroll down half way, place an article in the center, and place your mouse near it (but over white space) so you can track changes in page position.
4) roll your scroll wheel forward and back evenly without removing your finger from the wheel, do this slowly multiple times.
5) stop and let the page scroll settle.

expected: When you stop and the wheel is in its starting position, the article you were tracking should be back at original position.

result: I end up all over the place in the document. Usually the page ends up near the top.

Comment 1

[Jim Mathies [:jimm]]

Also, this might depend on precision scroll mice. Notched mice not reproduce. I tried to reproduce this on a Surface Pro with an inexact external mouse attached and couldn't.

Comment 2

[Kartikaya Gupta (email:[e-mail])]

Does this still happen? It may have been fixed by bug 1157409.

Comment 3

[Jim Mathies [:jimm]]

I can't test, scrolling with the mouse wheel hangs the browser - https://crash-stats.mozilla.com/report/index/ad958dc0-b622-47a3-824d-95f702150504

Comment 4

[Kartikaya Gupta (email:[e-mail])]

I filed bug 1161040 for the hanging issue.

Comment 5

[Kartikaya Gupta (email:[e-mail])]

Hey, sorry to keep bugging you - can you re-test now? The hanging issue should be fixed.

Comment 6

[Jim Mathies [:jimm]]

sorry this will have to wait a bit longer as I'm in the middle of a move, so the mouse/system in question are in a box until June.

Comment 7

[Jim Mathies [:jimm]]

seems to be fixed

Comment 8

[Kartikaya Gupta (email:[e-mail])]

Thanks!