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* Panel's CSS related to WidgetButtons has been improved. The styling for
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Panel's header is now much more flexible, while maintaining the position of
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the close button across browsers and varying amounts of content.
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* Panel now has a working Night skin. [Ticket #2530937]
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* The sprite image assets for the "close" button on Panels have moved into the
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WidgetButtons extension's assets. [Ticket #2530952]
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* See also Widget and extensions for changes to dependencies.