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// Moving from empty region-content towards the opposite one,
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// hide empty one (only for region-pre, region-post areas at the moment).
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regionname = this.get_region_id(drop.ancestor('div.'+CSS.BLOCKREGION));
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if (!documentbody.hasClass('side-'+regionname+'-only')) {
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documentbody.addClass('side-'+regionname+'-only');