Revert "Tabs: Remove display property on hidden panels instead of setting display:block. Surfaced by domEqual now checking for style property (see d687a1b)."
Revert "Tabs: Remove display property on hidden panels instead of setting display:block. Surfaced by domEqual now checking for style property (see d687a1b)."

This reverts commit b9068c1523f39da8a04c799eebc9adc8b83c7279.

GrayYoung/jQuery.UI.Extension,GrayYoung/jQuery.UI.Extension