/usr/share/themes/Adwaita-dark/gtk-2.0/hacks-dark.rc is in gnome-themes-extra-data 3.28-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | # vim:set ft=gtkrc ts=2 sw=2 sts=2 ai et:
#
# GTK+ 2 hardcodes a light shadow under certain inactive things. We can use this
# horrible workaround to make it at least distinguishable.
style "dark_insensitive" {
fg[INSENSITIVE] = "#000000"
text[INSENSITIVE] = "#000000"
}
widget_class "*<GtkButton>*" style "dark_insensitive"
widget_class "*<GtkComboBoxText>.<GtkCellView>" style "dark_insensitive"
widget_class "*<GtkMenuItem>*" style "dark_insensitive"
widget_class "*<GtkMenuBar>.<GtkMenuItem>.<GtkLabel>" style "dark_insensitive"
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