Automagically save current session with rc.lua.

rc.lua

function window.init_funcs.auto_session_save (w)
    w.tabs:add_signal("page-removed", function ()
        if not session.closing then
            w:save_session()
        end
    end)
    session.closing = false
    session.old_close_win = w.close_win
    w.close_win = function (w, force)
        session.closing = true
        session.old_close_win(w, force)
    end
end
function webview.init_funcs.auto_session_save (view, w)
    view:add_signal("property::uri", function ()
        w:save_session()
    end)
end
-- Save current window session helper
window.methods.save_session = function (w)
    session.save({w,})
end