This bug was fixed in the package gnome-themes-standard - 3.22.3-1ubuntu2
--------------- gnome-themes-standard (3.22.3-1ubuntu2) artful; urgency=medium
* Use HighContrast icons for the HighContrast theme. (LP: #1644662)
-- Dariusz Gadomski <email address hidden> Thu, 08 Feb 2018 07:52:35 +0100
This bug was fixed in the package gnome-themes- standard - 3.22.3-1ubuntu2
--------------- standard (3.22.3-1ubuntu2) artful; urgency=medium
gnome-themes-
* Use HighContrast icons for the HighContrast theme. (LP: #1644662)
-- Dariusz Gadomski <email address hidden> Thu, 08 Feb 2018 07:52:35 +0100