`re-add` called on files inside exact_ directories turns templates into regular files

#!/bin/sh

set -ex

# create an empty directory to use as the $HOME during the test and cd into it
rm -rf chezmoi-test
mkdir chezmoi-test
cd chezmoi-test
export HOME="$PWD"

# create an empty config file
mkdir -p .config/chezmoi
touch .config/chezmoi/chezmoi.toml

# initialize chezmoi
chezmoi init

# create a non-template file, add it to chezmoi and make its directory exact_
mkdir dir
echo regular > dir/regular
chezmoi add dir/regular
chezmoi chattr exact dir

# create a template in the source and call `chezmoi apply` to add it to the target
echo template > .local/share/chezmoi/exact_dir/template.tmpl
chezmoi apply

# the file has a .tmpl extension in the source
ls .local/share/chezmoi/exact_dir/template*

# modify the non-template file and call `chezmoi re-add` on it (not its directory)
echo regular2 > dir/regular
chezmoi re-add dir/regular

# the template turned into a regular file (it no longer has the .tmpl extension in the source)
ls .local/share/chezmoi/exact_dir/template*