input method window lags behind when autocommit happens

When the input method autocommit a string, and move forward with a new preedit string, the input method window doesn't move along with the cursor until another key is pressed.

In the attached screencast, with the Wubi (五笔) input method, type "wqvbk", "你好" is autocommitted and "中" is the new preedit string. The input window is misaligned until another key "b" is pressed.