message: Don't change background colour if the QColorDialog was aborted
diff: @@ -3104,7 +3104,7 @@ void TextureViewer::on_backcolorPick_clicked()
  QColor col = QColorDialog::getColor(Qt::black, this, tr("Choose background colour"));
  if(!col.isValid())
  - col = QColor(0, 0, 0);
  + return;
  col = col.toRgb();
  m_TexDisplay.darkBackgroundColor = m_TexDisplay.lightBackgroundColor =
  