RICHED20: Avoid flicker

[Phil Krylov]

Hi,

this patch needs to be applied after the "Re: RICHED20: Implement
EM_SETRECT, EM_SETRECTNP and WM_SETREDRAW messages (fixed)" patch.

ChangeLog:

Avoid flicker in RichEdit using proper update region invalidation and an
offscreen bitmap.

-- Ph.
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