funny cursor movement using C-f on composition?

[Miles Bader]

With the following string displayed in an emacs buffer:

   yá̧̗̂̄h!

Moving the cursor _backwards_ with C-b (starting on "!", ending on "y")
seems to work correctly, but moving _forwards_ with C-f (starting on
"y", ending on "!"), the cursor "sticks" once after moving from "a" to
"h", before moving from "h" to "!".

The sequence of cursor positions with C-f is:

   0 y  pos 1
   1 a  pos 2
   2 ́
   3 ̗
   4 ̧
   5 ̂  pos 3
   6 ̄
   7 h  pos 4
   8 !  pos 5

So, "pos 3" is unexpected...

Thanks,

-Miles

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