It's /usr/share/themes/{Amb,Rad}iance/gtk-3.20/gtk-widgets.css line 18:

  .background:backdrop {
      color: @backdrop_fg_color;
      box-shadow: inset -1px 0 shade (@bg_color, 0.94);
                        ^^^^
  }

Change that to 0 (or I guess you could remove the entire line or even
the entire segement).

(I'm not a gtk css expert by any means, I don't know if this is _the_
proper way to solve this issue, nor whether it causes problems
elsewhere.)

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https://bugs.launchpad.net/bugs/1986450

Title:
  Visual artifact 1px vertical white line right side of the wallpaper

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