The gl/gles/femtovg pref forced QSG_RHI_BACKEND=opengl on every non-macOS
host, dragging Windows off its healthy d3d11 default onto desktop GL. That
is a downgrade, not the GPU tier the pref means, so Windows takes the same
remap macOS already had.
And with no explicit style Qt loads Windows on Windows and Fusion on
Linux, never Basic, so the popups without an explicit background inherit
native chrome. Pinned before QGuiApplication, since it must run before the
first QtQuick.Controls import, and windeployqt then ships one style.
cc
vicrodh
8a08dcb69e