message: Fix sidebar header line alignment
diff: @@ -111,7 +111,7 @@ SidebarBlock::SidebarBlock(Sidebar *parent, const wxString& label, int flags)
  wxSizerFlags().Expand().Border(wxBOTTOM|wxLEFT, PX(2)));
  }
  m_headerSizer = new wxBoxSizer(wxHORIZONTAL);
  - m_headerSizer->Add(new HeadingLabel(parent, label), wxSizerFlags().Expand());
  + m_headerSizer->Add(new HeadingLabel(parent, label), wxSizerFlags().Center());
  m_sizer->Add(m_headerSizer, wxSizerFlags().Expand().PXDoubleBorder(wxLEFT|wxRIGHT));
  }
  m_innerSizer = new wxBoxSizer(wxVERTICAL);
  