message: Update volume opacity/density range
diff: -// Copyright 2009-2021 Intel Corporation
  +// Copyright 2009-2022 Intel Corporation
  // SPDX-License-Identifier: Apache-2.0
  #include "TransferFunctionWidget.h"
  @@ -99,9 +99,11 @@ void TransferFunctionWidget::updateUI()
  ImGui::Text("Opacity scale");
  ImGui::SameLine();
  - if (ImGui::SliderFloat("##OpacityScale", &globalOpacityScale, 0.f, 10.f)) {
  + if (ImGui::SliderFloat("##OpacityScale", &globalOpacityScale, 0.f, 10.f))
  tfnChanged = true;
  - }
  + if (ImGui::IsItemHovered())
  + ImGui::SetTooltip("(value range is unbounded, slider is bounded for\n"
  + "convenience. shift-LMB to enter larger values manually)");
  ImGui::Separator();
  