Fix #1411, make the selection work with large images, where document.documentElement.scrollWidth is the viewport width, but document.body.scrollWidth is the full image width
Fix #1411, make the selection work with large images, where document.documentElement.scrollWidth is the viewport width, but document.body.scrollWidth is the full image width

fzzzy/pageshot,fzzzy/pageshot,mozilla-services/pageshot,mozilla-services/screenshots,fzzzy/pageshot,mozilla-services/pageshot,mozilla-services/screenshots,mozilla-services/screenshots,mozilla-services/pageshot,mozilla-services/pageshot,fzzzy/pageshot,mozilla-services/screenshots