PO Export doesn't seem to escape properly

[darthsteven]

Describe the bug
When using drush locale:export strings containing \ are not escaped fully.

To Reproduce
See: https://www.drupal.org/project/views_data_export/issues/3222763

drush locale:export en | msguniq -

Expected behavior
When exporting the string:

t('Indicates the character used for escaping. Defaults to a backslash (<code>\</code>).');

It should be exported as:

msgid ""
"Indicates the character used for escaping. Defaults to a backslash "
"(<code>\\</code>)."

Actual behavior
It is exported as:

msgid ""
"Indicates the character used for escaping. Defaults to a backslash "
"(<code>\</code>)."

Workaround
Not sure who's responsibility to escape the string is? The write component is in core!

System Configuration

Q	A
Drush version?	Drush Commandline Tool 13.3.3.0
Drupal version?	10.4
PHP version	8.2
OS?	Linux

Additional information
See: https://www.drupal.org/project/views_data_export/issues/3222763

[darthsteven]

Okay, it's because of this line:

drush/src/Commands/core/LocaleCommands.php

Line 178 in cfe465a

$this->output()->writeln(file_get_contents($file_uri));

This will mean that the output goes through a formatter, and changes the \\ to a \. Crazy!

Simple solution though:

$this->output()->writeln(file_get_contents($file_uri), OutputInterface::OUTPUT_RAW);