Bug#890845: HighContrast icon theme doesn't work with GTK3

[Yuri D'Elia]

Package: gnome-accessibility-themes
Version: 3.27.90.1-1
Severity: normal

Since the last update, the "HighContrast" icon theme only works for GTK2 programs.
GTK3 programs seem stuck with the default (tango?) theme.

My GTK3 config hasn't changed (.config/gtk-3.0/settings.ini has
gtk-icon-theme-name=HighContrast set).

-- System Information:
Debian Release: buster/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (800, 'experimental'), (500, 'unstable-debug')
Architecture: amd64 (x86_64)

Kernel: Linux 4.15.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)