message: Fix order-of-operations, update position/secondary columns first
  * We need to have the correct position and secondary columns before updating the
  mesh configuration that references them.
diff: @@ -2187,11 +2187,6 @@ void BufferViewer::OnEventChanged(uint32_t eventId)
  m_PostVS = bufdata->postVS;
  m_PostGS = bufdata->postGS;
  - UI_CalculateMeshFormats();
  - UpdateCurrentMeshConfig();
  -
  - populateBBox(bufdata);
  -
  // if we didn't have a position column selected before, or the name has changed, re-guess
  if(m_ModelVSIn->posColumn() == -1 ||
  bufdata->highlightNames[0] != bufdata->vsinConfig.columnName(m_ModelVSIn->posColumn()))
  @@ -2218,6 +2213,11 @@ void BufferViewer::OnEventChanged(uint32_t eventId)
  bufdata->gsoutConfig.columnName(m_ModelGSOut->secondaryColumn()))
  m_ModelGSOut->setSecondaryColumn(-1, m_Config.solidShadeMode == SolidShade::Secondary, false);
  + populateBBox(bufdata);
  +
  + UI_CalculateMeshFormats();
  + UpdateCurrentMeshConfig();
  +
  ApplyRowAndColumnDims(m_ModelVSIn->columnCount(), ui->vsinData);
  ApplyRowAndColumnDims(m_ModelVSOut->columnCount(), ui->vsoutData);
  ApplyRowAndColumnDims(m_ModelGSOut->columnCount(), ui->gsoutData);
  @@ -2420,7 +2420,8 @@ void BufferViewer::UI_ResetArcball()
  if(model)
  {
  int posEl = model->posColumn();
  - if(posEl >= 0 && posEl < model->columnCount() && posEl < bbox.bounds[stage].Min.count())
  + if(posEl >= 0 && posEl < model->getConfig().columns.count() &&
  + posEl < bbox.bounds[stage].Min.count())
  {
  FloatVector diag;
  diag.x = bbox.bounds[stage].Max[posEl].x - bbox.bounds[stage].Min[posEl].x;
  @@ -2703,7 +2704,8 @@ void BufferViewer::UpdateCurrentMeshConfig()
  if(model && nonRasterizedOutput)
  {
  int posEl = model->posColumn();
  - if(posEl >= 0 && posEl < model->columnCount() && posEl < bbox.bounds[stage].Min.count())
  + if(posEl >= 0 && posEl < model->getConfig().columns.count() &&
  + posEl < bbox.bounds[stage].Min.count())
  {
  m_Config.minBounds = bbox.bounds[stage].Min[posEl];
  m_Config.maxBounds = bbox.bounds[stage].Max[posEl];
  