Update imgAreaSelect to 0.9.10. fixes #25370.

git-svn-id: https://develop.svn.wordpress.org/trunk@25545 602fd350-edb4-49c9-b593-d223f7449a82
Trim leading whitespace from AJAX responses.

This fixes the warning "$(html) HTML strings must start with '<' character" by jQuery Migrate when adding nav menu items, post custom fields or comment replies.

fixes #23681.

git-svn-id: https://develop.svn.wordpress.org/trunk@25546 602fd350-edb4-49c9-b593-d223f7449a82