Opera browser using wrong overflow-property in accordion

[pv.burnabit]

Opera sets the css property overflow to visible instead of auto after opening a new slide.
Error occurs in jquery.ui.accordion.js in line 544:

var overflow = options.toShow.css( "overflow" ),
               percentDone = 0,
               showProps = {},
               hideProps = {},
               fxAttrs = [ "height", "paddingTop", "paddingBottom" ],
               originalWidth;

var overflow equals "auto" in all browsers except Opera. Wrong css property is then applied in line 596.

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Reproducing the problem:

• Start up Opera 11.52 and see the demo pages: ​http://jqueryui.com/demos/accordion/#fillspace
• Have a look at this thread: ​https://forum.jquery.com/topic/accordion-overflow-in-opera

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Dirty workaround:
Set overflow to "auto" in line 596.

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Software setup:

• MacOS 10.6.8
• Opera Browser 11.51 and 11.52
• jQuery 1.6.4
• jQuery UI 1.8.16

[Scott González]

Duplicate of #6971.