bug#12463: 24.2; pos-visible-in-window-p gets slower over time

[Chong Yidong]

Juanma Barranquero <lekktu@gmail.com> writes:

>> An unfortunate oversight; I've
>> committed a fix to the trunk.
>
> I had a patch ready...

My apologies.  I assumed, from your previous messages, that you were
working on something orthogonal (moving the library cache stuff out of
w32).