xianwei zheng (@baikaishiuc) commented about dlls/win32u/dce.c:
if (end_paint || (dce->flags & DCX_CACHE)) delete_clip_rgn( dce ); if (dce->flags & DCX_CACHE) {
set_dc_opengl_drawable( dce->hdc, NULL );
This code change caused screen tearing in our internal software.