make display margin configurable

[nschloe]

See #3637.

[codecov]

Codecov Report

Merging #3638 (d3604ed) into main (9e3ae4d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3638   +/-   ##
=======================================
  Coverage   93.53%   93.53%           
=======================================
  Files          90       90           
  Lines        6669     6669           
  Branches     1549     1549           
=======================================
  Hits         6238     6238           
  Misses        400      400           
  Partials       31       31           

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