bug#11963: 23.4; flyspell should update display after dictionary insertion

[Chong Yidong]

Norman Ramsey <nr@cs.tufts.edu> writes:

>     C-x C-f /tmp/foo.txt
>     M-x text-mode
>     M-x load-library flyspell
>     M-x flyspell-mode
>     This MRFy theorem
>
>     M-b M-b M-$ i y
>
>   At this stage 'MRFy' should no longer be highlighted as misspelled.
>   But it remands highlighted until we move off of if, and if we move using
>   M-> or similar, it does not get updated properly.  It should be updated
>   immediately upon insertion into the dictionary.

Thanks, fix committed to trunk.