message: Fix tab bar size calculation to account for tab margin
diff: @@ -617,7 +617,8 @@ QSize RDStyle::sizeFromContents(ContentsType type, const QStyleOption *opt, cons
  {
  // have a maximum size for tabs
  return size.boundedTo(QSize(Constants::TabMaxWidth, INT_MAX))
  - .expandedTo(QSize(Constants::TabMinWidth, 0));
  + .expandedTo(QSize(Constants::TabMinWidth, 0)) +
  + QSize(Constants::TabMargin * 2, 0);
  }
  else if(type == CT_CheckBox || type == CT_RadioButton)
  {
  