This file is indexed.

postinst is in libgtk2.0-0 2.24.25-3+deb8u2.

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-2.0/2.10.0/immodules
IMMODULES_DIR_OLD=/usr/lib/gtk-2.0/2.10.0/immodules

if [ "$1" = triggered ]; then
    # This is triggered everytime an application installs a
    # GTK immodule loader
    /usr/lib/x86_64-linux-gnu/libgtk2.0-0/gtk-query-immodules-2.0 --update-cache || true
    exit 0
fi

# Automatically added by dh_makeshlibs
if [ "$1" = "configure" ]; then
	ldconfig
fi
# End automatically added section


# Also handle the initial installation
if [ -d $IMMODULES_DIR ] || [ -d $IMMODULES_DIR_OLD ]; then
     /usr/lib/x86_64-linux-gnu/libgtk2.0-0/gtk-query-immodules-2.0 --update-cache || true
fi