[PATCH 2/2] user32/listbox: Optimize SetCount partly

[Gabriel Ivăncescu]

On Wed, Sep 19, 2018 at 1:55 PM, Huw Davies <huw at codeweavers.com> wrote:
>
> I'm also concerned that we won't get WM_MEASUREITEMs in the
> LBS_OWNERDRAWVARIABLE case.
>
> Huw.

I don't know if that's an issue since SetCount should theoretically be
an "instant" operation and these items are just added at the end as
empty. I think Windows doesn't even support SetCount without
LBS_NODATA (which is not supported by Wine yet, I think I'll try
working on it and implement it in an optimal way, i.e. with the
minimum amount of memory needed, since it's meant for very very large
lists).

But, at least for now, I can fall back to the original (unoptimal)
behavior if OWNERDRAWVARIABLE is set, would that be acceptable?