[PATCH 0/1] MR6683: win32u: Use parent-relative coordinates for old window rectangles.

[Rémi Bernon (＠rbernon)]

Since 4e06b87633ec7e04822ad4f4854df7ae43f0d7e0, we are moving the window rects,
which is in screen coordinates for the old rects, because invalidate_dce expects
it, but in parent coordinates for the new rects.

This makes the old and new rectangles to be consistently using parent-relative
coordinates, fixing some broken window bits copy with child windows.

Fixes 4e06b87633ec7e04822ad4f4854df7ae43f0d7e0