message: Better IssueLabel::UpdateColor MSW implementation
diff: @@ -272,9 +272,8 @@ protected:
  m_label->SetForegroundColour(m_fg);
  #ifdef __WXMSW__
  - m_label->SetBackgroundColour(m_bg);
  - if (m_icon)
  - m_icon->SetBackgroundColour(m_bg);
  + for (auto c : GetChildren())
  + c->SetBackgroundColour(m_bg);
  #endif
  }
  