jQuery Bulldozes Other IE Filters When Assigning Opacity

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Steps to Reproduce:

Assign a background gradient to an element in your external CSS, like so:

filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#ffff0000', EndColorStr='#ffffffff');

On the same element, set a moderate opacity:

$(elem).css('opacity', '0.5');

Your gradient will disappear.

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Steps to Fix:

1. Use elem.currentStyle['filter'] to see the full filter list
2. If the Alpha filter isn't already applied, add to the filter list (space- or comma-delimited)
3. If it does exist previously, modify via elem.filters["DXImageTransform.Microsoft.Alpha"].opacity = Number_between_0_and_100

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Fiddle:  http://jsfiddle.net/brianblakely/22Nac/16/

[lrbabe]

Here is a pull request, also fixing #8401  https://github.com/jquery/jquery/pull/256

[rwaldron]

Can you add some unit tests for this?

[john]

Landed.