135503 - Javascript-driven "headline scroller" changes size of window scrollbar

Status: RESOLVED DUPLICATE of bug 45597

(Core :: Layout, defect, P4)

Description

[neilr8133]

From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; en-US; rv:0.9.9+) Gecko/20020404
BuildID:    2002040403

When visiting http://www.zoloft.com/ with JavaScript turned on, there is a
"headline scroller" on the left side of the screen.  While it runs, the
scrollbar (on the right side of the Mozilla window) keeps changing size (getting
larger and smaller), cyclically (sp) growing and shrinking.  When JavaScript is
turned off, the headline scroller is inactive, and the scrollbar does not change
size.

Java does not need to be active to reproduce the bug, and none of the "extended
options" (under Edit | Preferences | Advanced | Scripts & Windows ) need to be
enabled, as long as the master "Enable JavaScript for Navigator" box is checked.

Reproducible: Always
Steps to Reproduce:
To see the problem:
1. Start Mozilla.
1b. (Optional): Disable Java and all extended JavaScript options, but leave the
master "Enable JavaScript for Navigator" box enabled.
2. Load http://www.zoloft.com/
3. Watch the scrollbar.


Actual Results:  Window scrollbar started changing size.

Expected Results:  Mozilla scrollbar should not be changing size.

To confirm the problem is JavaScript:
1. Turn off the master "Enable JavaScript for Navigator" box.  The headlines
should stop scrolling, and the status bar will stop changing size

Comment 1

[Phil Schwartau]

Confirming reported behavior with Mozilla trunk build on WinNT.

JS Engine is not responsible for the size of the scrollbar;
reassigning to XP Toolkit/Widgets for a look. cc'ing self in case
I can help with JS debugging in any way -

Comment 2

[John Morrison]

(First, I'll note that there are a couple of plain old programming errors in 
that page [duplicated code in one place, and it also botches the browser sniff 
and decide that we are both NS 6 and Nav4 capable]. But those aren't the reason 
for the scrolling problem].

This is the kind of thing that evaughan used to do. I'm not sure who really 
owns this now. Try layout, I suppose. 

Note: this happens in embedding builds too.

Comment 3

[John Morrison]

Attachment: simple testcase; scrolling and clipping

... although, this bug does seem familiar (there may be a duplicate somewhere).

Comment 4

[Christine Hoffman]

Changing QA contact

Comment 5

[Christopher Hoess (gone)]

->jkeiser

Comment 6

[Boris Zbarsky [:bzbarsky]]

*** This bug has been marked as a duplicate of 45597 ***