Bug : Orientation, vFlip and viewports

I think the line in ofMatrixStack.cpp:

https://github.com/openframeworks/openFrameworks/blob/cf0064494962e7d16dd1f756f08ca746ed726bf6/libs/openFrameworks/utils/ofMatrixStack.cpp#L133

    if (vflip){
        y = getRenderSurfaceHeight() - (y + height);
    }

should be:

    if (vflip && !(!doesHWOrientation() && OF_ORIENTATION_90_RIGHT)){
        y = getRenderSurfaceHeight() - (y + height);
    }

this seems to fix things for me (iPad in horizontal with home button on left, whichi is OF_ORIENTATION_90_RIGHT). but my mind isn't very trained right now to understand all the orientation flags, so advice is welcome

Start in libs/openFrameworks/utils/ofMatrixStack.cpp at the linked line and trace how vflip, doesHWOrientation(), and OF_ORIENTATION_90_RIGHT affect viewport coordinates. Reproduce the reported iPad landscape case with the home button on the left, then verify that viewport positioning is correct without breaking other orientations. Done means the orientation-specific viewport behavior is confirmed and covered by the project’s available validation path.