-delay option on convert does not work properly

Hi,

Short intro: I'm a new co-maintainer of the Fedora package ImageMagick and as 
such walking through all open ImageMagick bugs in Fedora's bugzilla.

Sofar all have been fixed in 6.4.0-10, but this one is still present there:

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Description of problem:
The option to set the delay between frames when creating an animated gif does
not work properly in the convert command.

For example, I have 3 gif images: test01.gif, test02.gif and test03.gif.  If I
try to make a pair of animated gifs out of them as follows:

convert test??.gif -delay 200 -coalesce anim1.gif
convert test??.gif -delay 1000 -coalesce anim2.gif

The two results are identical and the time between frames is the default - i.e.
it appears that -delay has no effect.

I tried the same commands on a Redhat 9 machine running
ImageMagick-5.4.7-18.legacy and the operation worked correctly - the delay
between frames was slower and differed between images.

Steps to Reproduce:
1.Get a few .gif frames together
2.Try to combine them into an animated gif with different delays using the
-delay option to convert
3.View them in firefox

Actual results:
Delay unaffected by settings.

Expected results:
Delay should be according to setting.

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You can watch the entire Fedora bugreport here:
https://bugzilla.redhat.com/show_bug.cgi?id=194554

Regards,

Hans