latex-indent-within-escaped-parens

latex-indent-within-escaped-parens is a variable defined in `tex-mode.el'.
Its value is

nil

Documentation:
Non-nil means add extra indent to text within escaped parens.
When this is non-nil, text within matching pairs of escaped
parens is indented at the column following the open paren. The
default value does not add any extra indent thus providing the
behavior of Emacs 22 and earlier.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 23.1 of Emacs.