This file is indexed.

postinst is in libgtk-3-0 3.18.9-1ubuntu3.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#!/bin/sh
set -e

IMMODULES_DIR=/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/immodules
IMMODULES_DIR_OLD=/usr/lib/gtk-3.0/3.0.0/immodules

if [ "$1" = triggered ]; then
    # This is triggered everytime an application installs a
    # GTK immodule loader
    /usr/lib/x86_64-linux-gnu/libgtk-3-0/gtk-query-immodules-3.0 --update-cache || true
    exit 0
fi



# Also handle the initial installation
if [ -d $IMMODULES_DIR ] || [ -d $IMMODULES_DIR_OLD ]; then
     /usr/lib/x86_64-linux-gnu/libgtk-3-0/gtk-query-immodules-3.0 --update-cache || true
fi