763825 - Scroll amount is very little with hold mousedown scroll arrow if smooth scroll enabled.

Status: RESOLVED WORKSFORME

(Core :: Web Painting, defect)

Description

[Alice0775 White]

Build Identifier:
http://hg.mozilla.org/releases/mozilla-release/rev/2b643ea8edf9
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:13.0) Gecko/20100101 Firefox/13.0 ID:20120601045813

I notice a problem when I test Bug 763504.

Steps to Reproduce:
1. Create clean profile
2. Open http://docs.sencha.com/ext-js/4-1/#!/example/grid/array-grid.html
3. Try to scroll the table with  hold mouse down scroll arrow

   "aaaa".match('//b[@class="powered-by"]/a[contains(@href, "sites.google.com")]')


Actual Results:
 Scroll is very slow, scroll amount is very little.

Expected Results:
 Scroll should be performed as same as before

Regression window:
Good:
http://hg.mozilla.org/mozilla-central/rev/047c8ba7d2e4
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120115 Firefox/12.0a1 ID:20120115112312
Bad:
http://hg.mozilla.org/mozilla-central/rev/a895ecb782e1
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0a1) Gecko/20120116 Firefox/12.0a1 ID:20120116022308
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=047c8ba7d2e4&tochange=a895ecb782e1
Triggered by:
f7c8c8ee3fad	Jared Wein — Bug 198964 - Enable smooth scrolling by default. r=gavin

However, this problem existed in earlier version if smooth scroll enabled.

Comment 1

[Alice0775 White]

please ignore a line in comment #0
> "aaaa".match('//b[@class="powered-by"]/a[contains(@href, "sites.google.com")]')

Comment 2

[Timothy Nikkel (:tnikkel)]

I wonder if this has the same cause as bug 726468.