disable icomplete-mode(too slow on large project, such as Linux)
disable unused packages
search .dir-locals.el on remote machine
session: fixed a frame restore bug

假设屏幕的大小是这样：

        ----------------
        |              |
        |              |
        |     Emacs    |
        |              |
        |              |
        |              |
        ----------------

窗口在下次启动时，会变成这样：

        ----------------
        |       |      |
        | Emacs |      |
        |       |      |
        |--------      |
        |              |
        |              |
        ----------------