Method repositionVfoFlags

src/gui/SpectrumWidget.cpp:9251–9294

Reposition VFO widgets. paintEvent() is compiled only in software mode (#else !AETHER_GPU_SPECTRUM), so in GPU mode this is the sole place VFOs are repositioned. Logic mirrors the paintEvent() block below exactly. Called from renderGpuFrame BEFORE the flag-layer render so a dragged flag's snapshot is rasterized at this frame's position (no one-frame lag). (#3617)

// from renderGpuFrame BEFORE the flag-layer render so a dragged flag's snapshot
// is rasterized at this frame's position (no one-frame lag).  (#3617)
void SpectrumWidget::repositionVfoFlags(const QRect& specRect)
{
    QVector<VfoPos> vfos;
    for (const auto& so : m_sliceOverlays) {
        if (auto* vw = m_vfoWidgets.value(so.sliceId, nullptr)) {
            int x = mhzToX(so.freqMhz);
            if (so.mode == "RTTY" || so.mode == "DIGL") {
                double hiMhz = so.freqMhz + so.filterHighHz / 1.0e6;
                x = mhzToX(hiMhz) + 4;
            }
            vfos.append({so.sliceId, x, vw, so.splitPartnerId, &so});
        }
    }
    std::sort(vfos.begin(), vfos.end(), [](const VfoPos& a, const VfoPos& b) {
        return a.x < b.x;
    });

    const int panelW = vfos.isEmpty() ? 0 : vfos[0].w->width();
    const int specW  = specRect.width();

    QMap<int, VfoWidget::FlagDir> dirMap;
    assignDiversityPairDirections(vfos, dirMap);
    assignSplitPairDirections(vfos, dirMap);
    assignModeForcedDirections(m_sliceOverlays, dirMap);

    if (vfos.size() == 1) {
        VfoWidget::FlagDir dir = dirMap.value(vfos[0].sliceId, VfoWidget::Auto);
        if (!dirMap.contains(vfos[0].sliceId) && vfos[0].overlay) {
            dir = singleVfoFlagDirectionForOverlay(
                *vfos[0].overlay, vfos[0].w, vfos[0].x, specW);
        }
        vfos[0].w->updatePosition(vfos[0].x, specRect.top(), dir);
    } else {
        for (int i = 0; i < vfos.size(); ++i) {
            VfoWidget::FlagDir dir = VfoWidget::Auto;
            if (dirMap.contains(vfos[i].sliceId)) {
                dir = dirMap[vfos[i].sliceId];
            } else {
                dir = deconflictedVfoFlagDirection(vfos, i, panelW, specW);
            }
            vfos[i].w->updatePosition(vfos[i].x, specRect.top(), dir);
        }
    }
}

void SpectrumWidget::render(QRhiCommandBuffer* cb)
{