783744 - scrollable overflow-y allows hidden overflow-x to become scrollable

Status: RESOLVED DUPLICATE of bug 674477

(Core :: Layout, defect)

Description

[Paul O'Shannessy [:zpao] (not bugmail, email directly)]

Attachment: test case

STR:
1. load test file
2. attempt to scroll horizontally (shouldn't & doesn't work)
3. begin to scroll vertically with trackpad
4. start scrolling horizontally (oops!)

I've only been able to use this with my trackpad. Using keyboard arrows doesn't work and I haven't had a chance to test with an external mouse of any kind. I only have access to a 10.8 machine right now.

This behavior isn't reproducible in Webkit/Presto and doesn't trigger until the initial vertical scroll, so I'm assuming we have it wrong.

This behavior is reproducible to at least 3.6 so it's not a recent regression (unless it was fixed and broke again).

Comment 1

[Masayuki Nakano [:masayuki] (he/him)(JST, +0900)]

Did you mean that only horizontal mouse wheel events cause horizontal scroll even if overflow-x is hidden? If so, I'll take this bug.

Comment 3

[Paul O'Shannessy [:zpao] (not bugmail, email directly)]

(In reply to Masayuki Nakano (:masayuki) (Mozilla Japan) (offline: 8/22 - 8/27) from comment #1)
> Did you mean that only horizontal mouse wheel events cause horizontal scroll
> even if overflow-x is hidden? If so, I'll take this bug.

Following a vertical scroll event, yes. It looks the bug this got duped to has the same STR so hopefully it's clear. Thanks!