Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54733Signed-off-by: David Kahurani <k.kahurani@gmail.com>

This is a generic implementation, which is probably fine for buffers
backed by system memory. The implementation for buffers backed by
GPU memory can probably be optimized.

Working around a macOS bug: -setLevel: is documented to move a window
in front of its new peers, but that doesn't happen on Ventura.

Credits to Byeong-Sik Jeon for the sequence, thanks!

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54864

So that a GCS_RESULTSTR followed by GCS_COMPSTR, without interruping the
composition, begins inserting the new composition text after the result
instead of before it.