Switch text direction in GEdit

You can force a paragraph to be RTL by adding Unicode control U+200F RIGHT-TO-LEFT MARK (RLM) to the beginning of the paragraph. Using:

Crtl+Shift+u Then 200f Enter

For easy entry, you may have to customize you keyboard layout. See reference.

There are more Unicode control characters:

U+200E LEFT-TO-RIGHT MARK (LRM), To do the reverse on a right-to-left environment.
U+061C ARABIC LETTER MARK (ALM), Note: Most users uses RLM instead which is more general and it works for Arabic scripts too.
More at Wikipedia: Bidirectional Text.

References:

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