Add Window.isVisible
Add Window.isVisible

desktop/desktop,shiftkey/desktop,artivilla/desktop,hjobrien/desktop,kactus-io/kactus,j-f1/forked-desktop,artivilla/desktop,say25/desktop,say25/desktop,gengjiawen/desktop,shiftkey/desktop,gengjiawen/desktop,shiftkey/desktop,shiftkey/desktop,desktop/desktop,artivilla/desktop,j-f1/forked-desktop,j-f1/forked-desktop,gengjiawen/desktop,say25/desktop,gengjiawen/desktop,kactus-io/kactus,hjobrien/desktop,kactus-io/kactus,say25/desktop,desktop/desktop,desktop/desktop,hjobrien/desktop,kactus-io/kactus,hjobrien/desktop,artivilla/desktop,j-f1/forked-desktop