System header causes incorrect placement of MR tabs at top of page

A picture is worth 1000 words:

image

  • Enable a "System Header" in Admin > Appearance
  • Observe an MR
    • merge-request-tabs-container is partially covered by the top nav bar
    • The coverage is approximately the same height as the system header, so I assume that the header was not included in the calculation of the placement of the "pinned" MR top tabs