_one_ item can have the focus at any time, we can maintain one such
rectangle per list, rather than per item. This is both more efficient,
and works for LVS_OWNERDATA listviews as well.

fail gracefully.

source length handling.

- Lots of cleanups, and simplifications.

implementation.

then ours again.

instead of using void*, and removed a number of type casts.

- Unify text attribute selection between Draw{Sub,}Item.
- Usual cleanups, and simplifications.

for managing linked lists.

Minor cleanups.

RemoveWindowSubclass.

- A lot faster drawing in report mode.
- A great deal of cleanup, and simplifications.

- Added tests for GDI and USER.

- Fix handling of new image lists.
- Small cleanups.

- Drawing optimizations when adding/removing columns.
- More cleanups, and simplifications.

Stewart).

- Minor bug fixes.