bidi-paragraph-direction is a variable defined in `C source code'.
Its value is

  • Automatically becomes buffer-local when set.
  • This variable is safe as a file local variable if its value
    satisfies the predicate which is a byte-compiled expression.

If non-nil, forces directionality of text paragraphs in the buffer.

If this is nil (the default), the direction of each paragraph is
determined by the first strong directional character of its text.
The values of `right-to-left' and `left-to-right' override that.
Any other value is treated as nil.

This variable has no effect unless the buffer's value of
`bidi-display-reordering' is non-nil.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.