Should the code editor show leading <?php and trailing ?> tags?

[Ribbontree]

Re-opened to discuss the UI issue in the code editor. Was:

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When WP lacks permission to generate wp-config.php during install, the textarea does not display the closing tag (?>) for a PHP file, despite the opening tag (<?php) appearing at the top.

I do not know what will happen if one does not manually add the closing tag. I suspect a PHP error will occur, but I did not test that.
This was tested with the nightly build, downloaded 14 hours ago.

Replying to Ribbontree:

I do not know what will happen if one does not manually add the closing tag. I suspect a PHP error will occur, but I did not test that.
This was tested with the nightly build, downloaded 14 hours ago.

Closing PHP tags are optional.

Duplicate of #10106

Re-opening this for the twist in the ticket's description...

I think having the closing tag will cause more problems than it fixes:

if you accidentally add whitespace after that tag, you will get an error each time WP tries to do a redirect.

fair enough. just wanted to ask.