should greatly improve stability of the wrap code and eliminate
regressions of the most recent versions)
- completely new scrollbar handling (much more reliable) and related
redraw fixes
- Page Down handler (no Page Up yet, fixing wrap/redraw/scrollbar bugs
was of higher priority)
- ME_JoinRuns didn't mark the paragraph for rewrapping, fixed.
- Removed PostQuitMessage(0) from WM_DESTROY handler (duh!).
- Use of EM_GETOLEINTERFACE is reported with FIXME instead of TRACE
(any app using this message is likely to encounter major problems).