bug#22989: 25.0.92; cursor flicks when inputing chinese chars using the pinyin input method

[zhanghj]

The input method is part of the operating system(mac OSX chinese
edition) and can be activated by hot key: command+space.

With pinyin input method activated, one or more English chars makes a
list of Chinese chars. After inputing a English char, the list is
updated. User can select a char in the list and the selected char will
be inserted in the Emacs buffer.