关于LINUX输入法候选框光标跟随的代码的一个网页

　　吾搜索后，发现真有牛人提供解决办法：

​​https://stackoverflow.com/questions/66290102/how-to-get-cursor-position-of-mcclim​​

　　有用内容如下：

Basically this is done by XIM_SET_IC_VALUES in the protocol. The values the spot location within a nested value of preedit attributes.

The spot is simply a X point (x, y). Despite of that, the point is a relative coordinates to the focus window. The focus window is also a part of ic vlaues, with property name XNFocusWindow.

If you don't set focus window, the client window that passed through XCreateIC will be used as the focus window.

    XVaNestedList preedit_attr;
    preedit_attr = XVaCreateNestedList(0, XNSpotLocation, &nspot, NULL);
    XSetICValues(ic, XNPreeditAttributes, preedit_attr, NULL);
    XFree(preedit_attr);

　　根据参数类型，找一下已有代码的对应内容，就可以实现了。