/etc/gimp/2.0/gtkrc is in gimp-data 2.8.22-1.
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 17 18 19 20 21 22 23 24 | # pixmap_path "<dir 1>:<dir 2>:<dir 3>:..."
#
# include "rc-file"
#
# style <name> [= <name>]
# {
# <option>
# }
#
# widget <widget_set> style <style_name>
# class <widget_class_set> style <style_name>
#
# You can add your own GIMP-specific GTK styles here.
#
# Adjust the size of previews in plug-in dialogs:
#
style "gimp-large-preview"
{
GimpPreview::size = 256
}
# class "GimpPreview" style "gimp-large-preview"
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