[PATCH 4/5] comctl32/listbox: Implement LBS_NODATA for single-selection listboxes

[Gabriel Ivăncescu]

Ok, I have a question on how to proceed now, after looking through and 
finishing the rework.

DeleteItem saves the item data & string at the beginning, *before* 
ResetContent. It has to.

If I special-case LBS_NODATA inside of it, I'll have to do it *twice* 
(one before saving, one after ResetContent), or duplicate ResetContent, 
which is pretty ugly.

So, with this in mind, should I still special case it inside of 
DeleteItem instead of RemoveItem? (or a helper inside RemoveItem, as per 
InsertItem).

This will also fix the O(n) issue. And in the end there will be the same 
amount of checks in the code. I think this is how I should proceed but I 
want to be sure before I send it in later if you don't want it.

Summary: there will be one check in RemoveItem's helper (like 
InsertItem) and one in ResetContent. Instead of having two checks in 
DeleteItem (and the O(n) thing).

Thoughts?