The "print" footprint is reset when the map is resized

[asaunier]

When the map is resized the "print" footprint is recentered and and set back to the maximum size that fits the map panel. This happens for instance in Chrome when the download bar appears after generating a PDF. Or when the user pans or zooms the map.

This seems related to https://github.com/camptocamp/cgxp/blob/master/geoext.ux/ux/SimplePrint/lib/GeoExt.ux/SimplePrint.js#L252-L258