When you select a font in the dropdown list with your mouse, it's automatically
placed in the top of the list for easy access next time around. But if you type
the name of the font in the box directly and hit return when the name is
displayed, that font is not placed in the top of the list.

steps to reproduce:

1. select a font from the font dropdown list
2. type something
3. click the box of the dropdown list and type a font name you know.
4. when the name appears hit return
5. type something
6. click the dropdown list, the first font is shown at the top but not the
second one.