Sideline message of flycheck is not updated after flycheck has rechecked the buffer

[Yevgnen]

The following are two test cases.

1. The error has been fixed and flycheck has performed a recheck, but the error message is still there unless the cursor is moved (by commands like C-p or C-n).
   

2. The error has been fixed and flycheck has performed a recheck warning that there're trailing whitespaces, but the sideline message is not updated.