Popup: Hide popup when offscreen. Fixes #5892.
Popup: Hide popup when offscreen. Fixes #5892.

arschmitz/jquery-mobile,arschmitz/jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/uglymongrel-jquery-mobile,arschmitz/jquery-mobile,hinaloe/jqm-demo-ja,hinaloe/jqm-demo-ja,hinaloe/jqm-demo-ja