Method driveVfoDragTune

src/gui/SpectrumWidget.cpp:6352–6361

Compute the slice target frequency under cursor X (offset-anchored, snapped) Tune the slice for the live, in-window drag path (cursor not at the edge). Deliberately routed through edgePanTuneRequested with the center UNCHANGED so the whole drag bypasses pan-follow/reveal: reveal is a position controller whose flag-extended trigger (#2761) fires asymmetrically a little inside the edge — inside our

// MainWindow handler skips the redundant pan command when the center is
// unchanged.  (user-reported)
void SpectrumWidget::driveVfoDragTune(int mx, const char* phase)
{
    const double mhz = snapToStep(xToMhz(mx) - m_vfoDragOffsetHz / 1.0e6, m_stepHz);
    qCDebug(lcPerf).nospace()
        << "SliceDrag phase=" << phase
        << " mx=" << mx << " w=" << width()
        << " center=" << m_centerMhz << " bw=" << m_bandwidthMhz
        << " tuneMhz=" << mhz;
    emit edgePanTuneRequested(m_centerMhz, mhz);
}

// Start the edge-pan velocity timer while the cursor sits in the edge zone
// (within kVfoDragEdgeZoneFrac of either border), stop it otherwise.  Returns