200557 - Animated GIF sometimes ignores 'loop only once' setting

Status: RESOLVED DUPLICATE of bug 199045

(Core :: Layout: Images, Video, and HTML Frames, defect)

Description

[Henry Throop]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4a) Gecko/20030401
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4a) Gecko/20030401

The URL above has an animated GIF (rotating 'G').  When I load it with 1.4a, it
rotates forever, even though my preferences setting is 'Animated images should
loop: Once'.  If I hit shift-reload, the page loads, displays, and the images
stops animating after one loop, as it should.

Reproducible: Always

Steps to Reproduce:
1.Set preferences to 'Animated images should loop: Once'
2.Load above URL
3.Observe that animation runs forever
4.Shift-reload
5.Image loops once, as intended

Actual Results:  
See above.  

Expected Results:  
See above

Regression; worked correctly under 1.3.  

Also, this bug only affects some pages.  The animated GIFs on the page
http://www.hearsequeen.com appear to behave properly.

Comment 1

[Henry Throop]

NB: Possibly related to bug 175509?

Comment 2

[Carl Hage]

I have observed this bug in nightly Phoenix 2003/04/07 and Mozilla:
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4a) Gecko/20030401.

This appears to be the same bug as 103166.

These are the same comments I added to bug 103166:

The Animated Images Looping setting seems to be ignored intermittently.
Usually it works, so it is difficult to reproduce. I don't know how
often animations fail to disable, but probably this bug occurs <10%
of the time.

As others have reported, reloading the image corrects the problem. It appears
as if the animation control is done while originally loading the image before
it is saved in the cache, and image preference is ignored when displaying
the results. This is a separate bug-- animation looping preference should
be obeyed each time an image is rendered.

Even though animation preference is affected by the cache, misleading
one when reproducing the problem, the bug is still present. Even when
erasing the cache and leaving animation looping set never, animated images
still occur.

Comment 3

[Carl Hage]

This is also a duplicate of bug 199045.

Comment 4

[Stefan Borggraefe]

*** This bug has been marked as a duplicate of 199045 ***