501379 - Trunk build scrolling more area (scrolling faster) than it previously has

Status: VERIFIED FIXED

(Core :: Widget: Win32, defect)

Description

[u88484]

Starting with today's trunk build (20090630), pages scroll further/faster than they did in the 20090629 build.

Comment 1

[u88484]

Bug 493037 looks like a good candidate for causing this.

Comment 2

[WildcatRay]

Another symptom: If mouse wheel scrolling is set to a page at a time, the browser page will move to the top or bottom of the page. I have to use the scroll bar to move to anywhere other than the top or bottom of the page if the page is more that two screen heights long.

Comment 4

[Mike Pesce (:By-Tor)]

This also appears on Windows 7.

Comment 5

[Jim Mathies [:jimm]]

Attachment: wheel fix

My refactor patch in 487245 split the wheel scroll event handling out into an
event handler, which introduced a bug where aRetValue was not set correctly. 

This patch addresses that and also adds some commenting to OnWheelScroll to
clearly explain what the handler does.

Comment 6

[2pawnder]

This also appears on Windows XP - Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2a1pre) Gecko/20090630 Minefield/3.6a1pre (.NET CLR 3.5.21022). This is extremely annoying. The middle-click-scroll speed is the same as it has always been, though.

Comment 7

[Jim Mathies [:jimm]]

http://hg.mozilla.org/mozilla-central/rev/9b3b3169bf08

Comment 8

[Jim Jeffery not reading bug-mail 1/2/11]

Verified Fixed using hourly build:
Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2a1pre) Gecko/20090630 Minefield/3.6a1pre Firefox/3.0.11 ID:20090630122827

changeset:
http://hg.mozilla.org/mozilla-central/rev/0ebf4f99895e

Comment 9

[(not currently active) Ted Mielczarek]

A unittest for this would be great. :)

Comment 10

[Jim Mathies [:jimm]]

(In reply to comment #9)
> A unittest for this would be great. :)

I was wondering the same thing, why didn't a unit test pick this up? Maybe it's hard to do as mouse drivers are involved in defining scroll speeds.

Comment 11

[Matt Cosentino]

This still seems to be happening in 3.6 alpha 1.  I'm running Windows 7.

Comment 12

[Sylvain Pasche]

(In reply to comment #11)
> This still seems to be happening in 3.6 alpha 1.  I'm running Windows 7.

What you see is not this bug, but an intentional change in the scrolling behavior. See http://margaret.mit.edu/2009/08/making-firefox-feel-faster/ for more details (bug 462809).